A tool that you get and hope it’s “money thrown away.” Potentially very useful, and the good thing is that it comes with a test glass so it can be tried out. It takes quite a bit of pressure to get the hammer out, but that’s not necessarily a bad thing; I’m just mentioning it.
I broke the glass inside its packaging so it wouldn’t scatter.
The seat belt cutter is equally good.
I would prefer the strap to be in a fixed spot and not on the cap, so it can be attached to the car keys, which will probably be the most easily accessible in an emergency.
I have put it in the compartment between the front seats, which I generally keep clean and with few things.
As for colors, I would suggest red and silver so they are more easily recognizable and locatable in case of panic.
On the car window, we use it on the small side (toward the side of the side mirrors) and not on the large side (toward the seat belt side).

Amazing quality! I even tried it on a thick glass peanut butter jar. I didn’t expect it to break it, but it did. I have attached it together with the base that is located on the side of the driver’s seat. The adhesive is very strong and does not come off at all.

Amazing quality! I’ve attached it together with the base that is on the side of the driver’s seat. The adhesive is very sturdy and won’t come off at all. Also, I even tried it on a thick glass peanut butter jar. I didn’t expect it to break it, but it did.

I would like it to have a fixed strap to attach to the keys. The one it has is on the lid and it can come off.

It seems good. Of course, I haven't needed it yet and hopefully no one ever will, but it appears to be capable, although it requires quite a bit of pressure on the glass to break it. That is, you don't press a button and the plunger comes out, but you simply press it as it is and the tip pops out and breaks it, then it returns to its original position without you doing anything or even seeing it, of course. Everything happens very quickly. The function I am describing is not mentioned anywhere in the manual.

An excellent tool, which is good to have in every car. Of course, hopefully it will never be needed. I tested it on an abandoned car, and it does what it promises. It is not for breaking the windshield, that is impossible. Only for side windows, driver and passenger.

It is a perfect product. Just keep in mind, it contains a small glass piece for testing; do not try to break it inside the house, do the test somewhere outside because the glass shatters into a thousand pieces…..

Very good accessory, hopefully unnecessary, I tried it with the sample glass they provide and it seems to do the job.

The test tube broke on the first attempt. It is small and convenient in size.

Very convenient size (fits in the palm), and nice construction.
The test glass that was included in the package broke precisely, with little force and safely.

Quality product. It literally shattered the test glass of the packaging! Small, discreet, essential for every car.

I hope I never need it, but if something happens, it gives me peace of mind just knowing it's in the car.

Premium material appearance, effective hammer function (test glass) and seat belt cutting function.
I suggest not to use the provided "base." Placing it on the shelves of a door is sufficient.
I hope you never need it!

It seems to be effective on the sample glass it includes. It is unnecessary to be... even for cutting the strip... However, if needed, let's not forget that it requires application around the edge of the glass, NOT in the center.

Nice sturdy construction. I broke the test glass easily without much force. Now, I haven't needed to use it in any emergency (and I hope I won't need to) but it seems reliable.

I bought it for safety reasons based on new legislation; when you have children in the car, you need to have certain things in case of an emergency

Very good, functional (considering that it has a breakable glass for packaging) and highly necessary for every car.
Among the additional positives, the integrated blade on the back for cutting the belt in case of emergency and the base with adhesive tape that allows you to stick it wherever convenient on the car dashboard.
Necessary not only for personal use, but also in case another driver is in danger.

At first contact, the tangible quality seems good. But the lid closes with pressure from a rubber ring placed in a groove on the main body. At least on one side, the second time I opened the lid, the rubber ring came off the groove and to close it, you have to put it back in place every time.

It should not be missing from any car and keychain! I hope I never need it! But if you use it, it will save your life!

Really for its money in relation to other ones that exist it is worth it and more. Sturdy construction, not plastic, strong and light, incredible how easily it works with the glass test it has inside, it breaks immediately without much effort (no strength or arms needed).
I put the base with the sticker under the steering wheel on the left for immediate use.

You can have it without the caps, I don't think they offer anything extra if you think it will delay you in an emergency.

I tried the glass that comes in the package and it broke immediately... I hope I don't need to use it.

Excellent and with particularly good materials. Similar products from China are clearly of inferior quality. It includes glass for breakage testing. The belt cutter works opposite to other products, where you clamp and pull the belt. Here, you essentially push to cut it. I hope I never have to use it. In the photo is the moment the test glass breaks.

Good for its price. It should be in every car for safety reasons. It has a small base that sticks with a sticker to any point of the car that is convenient for immediate access. A fair purchase

Small, discreet, and essential tool for the car. I consider the caps it has to be impractical because in a difficult moment, you won't have the mind to open and close caps. Fortunately, though, you can have it without them without it being dangerous

Top product. Perfect quality. It is a hammer for emergencies and a knife to cut the belt. It has a round glass inside to perform your test. I tried it on the box it came in and on a window of an old car, and it worked perfectly.

It looks like a quality product. I hope I never have to use it. It also has the ability to cut the passenger's seatbelt if necessary.

The review is about using it for testing purposes.. it was not used in a real situation.

It has a nice sturdy construction and easy installation with the suction cup base inside the car. An extra positive for me is the fact that in order to test it, there is a piece of glass/crystal included in the packaging that allows you to see the effectiveness of the product.
Honestly, I have never seen glass break so quickly with so little force and effort. I hope I never have to test it in real conditions, but if I need to, I know that I will be safe with such a gadget.

5/5 BUY IT!!!

I have bought 2 and I have placed them next to the car doors. Besides safety, they have a very nice aluminum construction and they are truly ornaments in the car cabin!

The tires are falling off and so are the caps. It really works, it breaks the glass and it also has a cutter for the seatbelt.

Carefully packaged. Beautiful in appearance. Safe with front and back lids. I haven't tried how it works. I hope I don't need to!