I am using the Swimcell for a small GPS that tracks my speed in the water during windsurfing. The quality of the case is pretty good, same as the bracelet. I ordered the longer bracelet because the small one is only for women or kids (or men without biceps). But you have to use the Swimmcell with care. After 70 sessions on the water, there was a leakage in the case. Unfortunately, I was not sufficiently aware of this and my tracker was damaged. Luckily I could save the device. Now I have ordered 2 more Swimcell cases to replace them when needed. So it's a great product, but with an expiration date.