It is used to charge a power armor 18 that supports up to 15W charging, so I have no idea how it behaves (or if it actually reaches) 50W. The charger has a small fan at its base that automatically activates when charging and significantly lowers not only the temperature of the charger but also that of the phone! Specifically, the phone does not exceed 39 degrees, while with a simple 10W desktop charger it reached 47 degrees. So it charges faster and stays cooler, which is good news for battery life! Apart from the fan and the Ulefone logo, it is a "simple" and very overpriced wireless charger that should be noted, of course, for those who didn't notice that the packaging does not include the power supply but only a USB-C to USB-C cable; I mention this not as a negative but just so that those who buy it know that they won't find a power supply inside the box. It will reach 15W or 50W as long as you connect it with a phone charger that you already have and that supports the appropriate power output; I use it with my phone's power supply that outputs up to 66W and it works just fine. There are two main problems with this wireless charger: The pad at the bottom that holds the phone is made of soft rubber and completely seals the phone's microphone, which in 99% of cases is also located at the bottom of the devices, so if you are charging the phone or if you simply use it as a stand, forget about phone calls, video calls, voice commands, etc., because the microphone hears nothing. In the Power armor 18, in fact, since the speaker is also located at the bottom right, we also forget about music! Apparently, over at Ulefone, one department doesn't communicate much with the other to design compatible devices with each other, even if just for show! The other problem, more serious for me and which loses it a star in the rating, is that when the battery fills to 90%, the charger stops and continuously starts charging again, resulting in the device blinking continuously; it does this about 10-20 times until it reaches 100% and stops. While charging to 100% is bad for the battery, I don't know if this continuous intermittent charging does more harm in the long run. Due to the excessive price at which it is sold and the last problem I described, I would not recommend it as a charger. The only thing I appreciated about the design is the fan and the benefit that the battery and the device have from the low charging temperature. I don't personally consider the problem with the microphone not being heard to be something terrible; anyway, even if we manage to make it work with a workaround (if we stick two rubber spacers, for example, to act as spacers at the bottom), the noise of the fan would still be heard by the caller since it is directly underneath.