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Tank M4 Stainless Steel 50mm Waterproof Smartwatch with Heart Rate Monitor (Black - M/L)
Smartwatches

Tank M4 Stainless Steel 50mm Waterproof Smartwatch with Heart Rate Monitor (Black - M/L)

Key features:

  • 1.96" AMOLED display up to 1000 nits
  • Diving depth up to 45 meters
  • 10 ATM and IP69K certification
  • Up to 15 days of battery life
  • 23 sports modes and GPS
See full description

Top specs

  • Battery Life

    Battery life shows how many days the smartwatch can operate without charging.


    It depends on the battery capacity, but also on how much you use it (e.g. active display, GPS, notifications, etc.).


    For example, a smartwatch with 2-3 days of battery life is ideal for daily use with all features enabled.


    Models with 5–10 days or more are suitable for those who do not want to charge often or use it more "lightly".


    The value is especially meaningful when comparing products from the same manufacturer.

  • Display Type

    AMOLED

    Advanced OLED screen type with better visual experience, almost perfect black performance, thin and light but with higher energy consumption than Super AMOLED.

  • Waterproof

    Sea Swimming

    The smartwatch offers enhanced durability so you can wear it in the sea. Resistant to saltwater and tough marine conditions, it is the ideal companion for your summer adventures.
  • See all
177 86 €
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Deals & Benefits

Κέρδισε κουπόνι 10€ με αγορά μέσω App!

Το θέλεις; Θα το ‘χεις! Κάνε μια παραγγελία άνω των 50€ από το Skroutz App μέσα στο ΣΟΥΚΟΥ και κέρδισε κουπόνι 10€ για την επόμενη παραγγελία σου άνω των 50€.

Η προσφορά ισχύει μέχρι την Κυριακή, 01/11, γι' αυτό βιάσου.

  • Απαραίτητη προϋπόθεση είναι η αγορά μέσω του Skroutz App.
  • Το κουπόνι 10€ ισχύει για μία (1) παραγγελία συνολικής αξίας προϊόντων άνω των 50€ με διεύθυνση αποστολής στην Κύπρο.
  • Το κουπόνι αποδίδεται αμέσως μετά την ολοκλήρωση της παραγγελίας με διάρκεια 5 ημέρες από την ημερομηνία απόδοσής του.

Terms & conditions apply
Delivery Friday, 06 November
3,50 € to a Skroutz Point or 4,50 € to an address
Do you want it with Free shipping?
Sent from Greece
From Shop404 5.0 (7)
5.0 (7 reviews)
Greece
5+ pieces
See Wearables on the page of Shop404
What if it breaks?

You're covered by the statutory 2-year warranty. Contact us and we'll handle the entire process with the store, ensuring your issue is resolved with prompt support through a repair, replacement, or refund.

What if I change my mind?

No problem, as long as it's within 14 days. We'll come pick it up or you can choose the Skroutz Point that suits you, completely free for up to 2 times per year, and we'll refund your money. Get Skroutz Plus to enjoy unlimited free returns.

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  • Extended warranty

    Mechanical or electrical failure of a component necessary for the device's operation/safe use - the same failures already covered by the original manufacturer's warranty, simply extending it by 1 year.

    • +Valid for 1 year
    • With the reliability of Allianz Partners
    Learn more
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Product report

Description

Description

The KOSPET TANK M4 is a rugged smartwatch designed especially for diving, durability, and outdoor use.

It features a 1.96-inch AMOLED display, a 10 ATM water-resistant design, and three dedicated dive modes for depths of up to 45 meters.

It also offers up to 15 days of typical battery life, GPS, and advanced sports and health-monitoring features.

1.96" AMOLED Display

The KOSPET TANK M4 features a large 1.96" AMOLED display with a resolution of 410 × 502 pixels, a pixel density of 331 PPI, and a 60 Hz refresh rate. Its maximum brightness reaches 1,000 nits, while the built-in ambient light sensor automatically adjusts brightness to match the conditions. This keeps information easy to read outdoors and in varying lighting conditions.

Diving and water resistance

The TANK M4 is specially designed for use in water, with 10 ATM water resistance and IP69K certification. It supports diving to depths of up to 45 meters and features three dedicated modes: Freedive, Scuba Dive, and Gauge. Depending on the activity, it records details such as depth, dive time, temperature, and ascent and descent rates.

Durability and rugged construction

The TANK M4 features stainless steel in its bezel, case, and physical buttons, creating a particularly durable structure. KOSPET states that the watch has been tested by SGS against up to 20 MIL-STD-810H military standard tests, including tests for vibration, impact, rain, dust, humidity, and extreme temperatures. Its design is intended for outdoor use and demanding activities.

Battery Life and Sports Features

The battery provides up to 14–15 days of typical use, up to 9–10 days of heavy use, and up to 21–22 hours of continuous GPS use. The TANK M4 also features 23 sports modes via ApexMotion, with workout and performance tracking. In addition, its health system uses a 4PD sensor to continuously monitor relevant metrics, while data syncs with the Apexmove app.

Manufacturer

Manufacturer Details

Warnings & Safety Information
See full description

Specifications

Specifications

Technical Specifications

Colour
Black
Release Date
2025
Screen Size
1.96 "

Screen Size

"The design and size of the casing affect how each screen size appears on the wrist. Most smartwatches have screens of 1.4-1.5 inches."
Screen Resolution
410x502 pixels
Screen Type
AMOLED

Screen Type

AMOLED

Advanced OLED screen type with better visual experience, almost perfect black performance, thin and light but with higher energy consumption than Super AMOLED.
Compatible Operating System
Android, iOS

Compatible Operating System

The smartphone must be compatible with the watch. Apple Watches only connect with iPhones, while some others can connect with both Android and iPhones, but some functions may not be fully supported.
Touch Screen
Yes
Internal Storage
32 GB

Internal Storage

The amount of information that can be stored on a smartwatch. Most modern smartwatches have a capacity of 32GB, while older or simpler smartwatches may have 4GB of internal memory. This space is mainly used for storing applications. It is particularly useful for smartwatches that can be used independently of a mobile phone, for example, for storing and playing music.
Connection
Bluetooth

Connection

Bluetooth
The basic way to connect your smartwatch to your mobile phone and other supported devices, such as wireless headphones.
Strap
Silicone
Case material
Stainless Steel

Case material

Stainless Steel
"The most popular material for constructing a case is more resistant to rust, impacts, and scratches compared to others, but with greater weight."

Features & Functions

Features
Vibration, Speaker, Microphone

Features

Speaker

Playback of multimedia, notification sounds, or voice.

Microphone
For voice commands or speech.
Features & Functions
Caller ID, Application / Calls Notification

Features & Functions

Caller ID

The smartwatch can display the name of the contact who is calling.

Application / Calls Notification

The smartwatch has the ability to transfer notifications from our mobile phone applications such as receiving SMS, Email or a notification from a social media application. Depending on the smartwatch, we may also be able to read it directly from it.
Use
Misc Sports / Gym, Swimming, Climbing, Hiking, Cycling, Running

Use

The smartwatch has the ability to record the corresponding activity and produce relevant statistics.

Additional Specifications

Sensors
GPS, Altimeter, Gyroscope, Heart Rate, Oximeter, Sleep Monitoring, Compass

Sensors

GPS
Technology that allows for the detection of geographic location via satellite. Particularly useful for navigation through map applications such as Google Maps.
Altimeter
Like a barometer, an altimeter measures atmospheric pressure by translating it into altitude, aiding in faster GPS location detection for navigation applications, as well as tracking how many floors we have climbed for health applications.
Gyroscope
A sensor that helps the device know its position in space. For example, it allows the device to understand when we turn our wrist to look at the screen.
Heart Rate

Embedded heart rate monitor.

Oximeter

Measure the amount of oxygen in the blood.

Sleep Monitoring

Recording of heart rate and breathing during sleep and diagnosis of problems according to the product. (e.g. restless sleep, lack of deep sleep, etc.)

Compass
Updates our device with its orientation, assisting in the use of navigation applications such as Google Maps.
Protection
Splash Resistant, Dust Resistant, Scratch Resistant
ATM Rating
10 ATM

ATM Rating

The ATM rating on smartwatches indicates their level of water resistance, which tells how well the watch can withstand exposure to water and various pressure levels.

3 ATM (30 meters): Suitable for everyday splashes, rain, and hand washing.

5 ATM (50 meters): Light swimming, showering.

10 ATM (100 meters): Swimming, snorkeling, water sports.

15 ATM (150 meters): Advanced swimming, water sports.

20 ATM (200 meters): Diving, deep water activities.

50 ATM (500 meters): Professional diving, excellent water resistance.
Waterproof
Sea Swimming

Waterproof

Sea Swimming

The smartwatch offers enhanced durability so you can wear it in the sea. Resistant to saltwater and tough marine conditions, it is the ideal companion for your summer adventures.
MIL-STD-810
Yes

Battery

Battery Capacity
500 mAh

Battery Capacity

Most smartwatches have a battery capacity of around 200mAh. 2. The size of the battery is not always indicative of the autonomy, as this largely depends on the features of the smartwatch and the functions we have active. 3. For example, a smartwatch with a large color touch screen and 24-hour heart rate monitoring will often require charging even if it has a larger battery than a simpler smartwatch.
Battery Life
15 days

Battery Life

Battery life shows how many days the smartwatch can operate without charging.


It depends on the battery capacity, but also on how much you use it (e.g. active display, GPS, notifications, etc.).


For example, a smartwatch with 2-3 days of battery life is ideal for daily use with all features enabled.


Models with 5–10 days or more are suitable for those who do not want to charge often or use it more "lightly".


The value is especially meaningful when comparing products from the same manufacturer.

Dimensions

Case Size
50 mm

Case Size

50
This size is usually intended for fruits with a circumference of over 20.5cm.
Weight
80 gr

AI Features

AI Voice Assistant
No
AI Training Coach
No
AI Health Insights
No

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

See all specifications
Questions

Questions

Do you have a question about the product?

6 users have this product and can help you

Ask for the product

Description & Specifications

The KOSPET TANK M4 is a rugged smartwatch designed especially for diving, durability, and outdoor use.

It features a 1.96-inch AMOLED display, a 10 ATM water-resistant design, and three dedicated dive modes for depths of up to 45 meters.

It also offers up to 15 days of typical battery life, GPS, and advanced sports and health-monitoring features.

1.96" AMOLED Display

The KOSPET TANK M4 features a large 1.96" AMOLED display with a resolution of 410 × 502 pixels, a pixel density of 331 PPI, and a 60 Hz refresh rate. Its maximum brightness reaches 1,000 nits, while the built-in ambient light sensor automatically adjusts brightness to match the conditions. This keeps information easy to read outdoors and in varying lighting conditions.

Diving and water resistance

The TANK M4 is specially designed for use in water, with 10 ATM water resistance and IP69K certification. It supports diving to depths of up to 45 meters and features three dedicated modes: Freedive, Scuba Dive, and Gauge. Depending on the activity, it records details such as depth, dive time, temperature, and ascent and descent rates.

Durability and rugged construction

The TANK M4 features stainless steel in its bezel, case, and physical buttons, creating a particularly durable structure. KOSPET states that the watch has been tested by SGS against up to 20 MIL-STD-810H military standard tests, including tests for vibration, impact, rain, dust, humidity, and extreme temperatures. Its design is intended for outdoor use and demanding activities.

Battery Life and Sports Features

The battery provides up to 14–15 days of typical use, up to 9–10 days of heavy use, and up to 21–22 hours of continuous GPS use. The TANK M4 also features 23 sports modes via ApexMotion, with workout and performance tracking. In addition, its health system uses a 4PD sensor to continuously monitor relevant metrics, while data syncs with the Apexmove app.

Manufacturer

Manufacturer Details

Warnings & Safety Information

Technical Specifications

Colour
Black
Release Date
2025
Screen Size
1.96 "

Screen Size

"The design and size of the casing affect how each screen size appears on the wrist. Most smartwatches have screens of 1.4-1.5 inches."
Screen Resolution
410x502 pixels
Screen Type
AMOLED

Screen Type

AMOLED

Advanced OLED screen type with better visual experience, almost perfect black performance, thin and light but with higher energy consumption than Super AMOLED.
Compatible Operating System
Android, iOS

Compatible Operating System

The smartphone must be compatible with the watch. Apple Watches only connect with iPhones, while some others can connect with both Android and iPhones, but some functions may not be fully supported.
Touch Screen
Yes
Internal Storage
32 GB

Internal Storage

The amount of information that can be stored on a smartwatch. Most modern smartwatches have a capacity of 32GB, while older or simpler smartwatches may have 4GB of internal memory. This space is mainly used for storing applications. It is particularly useful for smartwatches that can be used independently of a mobile phone, for example, for storing and playing music.
Connection
Bluetooth

Connection

Bluetooth
The basic way to connect your smartwatch to your mobile phone and other supported devices, such as wireless headphones.
Strap
Silicone
Case material
Stainless Steel

Case material

Stainless Steel
"The most popular material for constructing a case is more resistant to rust, impacts, and scratches compared to others, but with greater weight."

Features & Functions

Features
Vibration, Speaker, Microphone

Features

Speaker

Playback of multimedia, notification sounds, or voice.

Microphone
For voice commands or speech.
Features & Functions
Caller ID, Application / Calls Notification

Features & Functions

Caller ID

The smartwatch can display the name of the contact who is calling.

Application / Calls Notification

The smartwatch has the ability to transfer notifications from our mobile phone applications such as receiving SMS, Email or a notification from a social media application. Depending on the smartwatch, we may also be able to read it directly from it.
Use
Misc Sports / Gym, Swimming, Climbing, Hiking, Cycling, Running

Use

The smartwatch has the ability to record the corresponding activity and produce relevant statistics.

Additional Specifications

Sensors
GPS, Altimeter, Gyroscope, Heart Rate, Oximeter, Sleep Monitoring, Compass

Sensors

GPS
Technology that allows for the detection of geographic location via satellite. Particularly useful for navigation through map applications such as Google Maps.
Altimeter
Like a barometer, an altimeter measures atmospheric pressure by translating it into altitude, aiding in faster GPS location detection for navigation applications, as well as tracking how many floors we have climbed for health applications.
Gyroscope
A sensor that helps the device know its position in space. For example, it allows the device to understand when we turn our wrist to look at the screen.
Heart Rate

Embedded heart rate monitor.

Oximeter

Measure the amount of oxygen in the blood.

Sleep Monitoring

Recording of heart rate and breathing during sleep and diagnosis of problems according to the product. (e.g. restless sleep, lack of deep sleep, etc.)

Compass
Updates our device with its orientation, assisting in the use of navigation applications such as Google Maps.
Protection
Splash Resistant, Dust Resistant, Scratch Resistant
ATM Rating
10 ATM

ATM Rating

The ATM rating on smartwatches indicates their level of water resistance, which tells how well the watch can withstand exposure to water and various pressure levels.

3 ATM (30 meters): Suitable for everyday splashes, rain, and hand washing.

5 ATM (50 meters): Light swimming, showering.

10 ATM (100 meters): Swimming, snorkeling, water sports.

15 ATM (150 meters): Advanced swimming, water sports.

20 ATM (200 meters): Diving, deep water activities.

50 ATM (500 meters): Professional diving, excellent water resistance.
Waterproof
Sea Swimming

Waterproof

Sea Swimming

The smartwatch offers enhanced durability so you can wear it in the sea. Resistant to saltwater and tough marine conditions, it is the ideal companion for your summer adventures.
MIL-STD-810
Yes

Battery

Battery Capacity
500 mAh

Battery Capacity

Most smartwatches have a battery capacity of around 200mAh. 2. The size of the battery is not always indicative of the autonomy, as this largely depends on the features of the smartwatch and the functions we have active. 3. For example, a smartwatch with a large color touch screen and 24-hour heart rate monitoring will often require charging even if it has a larger battery than a simpler smartwatch.
Battery Life
15 days

Battery Life

Battery life shows how many days the smartwatch can operate without charging.


It depends on the battery capacity, but also on how much you use it (e.g. active display, GPS, notifications, etc.).


For example, a smartwatch with 2-3 days of battery life is ideal for daily use with all features enabled.


Models with 5–10 days or more are suitable for those who do not want to charge often or use it more "lightly".


The value is especially meaningful when comparing products from the same manufacturer.

Dimensions

Case Size
50 mm

Case Size

50
This size is usually intended for fruits with a circumference of over 20.5cm.
Weight
80 gr

AI Features

AI Voice Assistant
No
AI Training Coach
No
AI Health Insights
No

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

177,86 €
3,50 € to a Skroutz Point
Kospet