fast charging, perfect fit, portable size.i have to charge my Galaxy Watch 7 (40mm) every 24 hours so I keep one of these in my purse. it works flawlessly with a battery pack so I don't need to worry about the cord not being long enough to reach most of my USB outlets.the charger that came with the watch uses a USB-C port, so it's a lot harder to find a place for charging. I have to use an adapter to use it most of the time. THESE are much more functional with a more useful design. the magnets are strong enough to keep the watch back attached pretty well while charging, and I've had no issues with the charger heating up more than a *very* tiny bit when charging more than 80%.