1. High quality material: made of tensile nylon Lycra diving material, the cuff is easy to bend, bend, twist or fold, and will not warp. The adjustable belt protection and stabilization device will not slide or shrink.2. Special design: with obvious power and volume button pattern printing, you can press the button more easily. The built-in key pocket and back pocket can store your house key, ID card, credit card and cash when you exercise.3. Delicate cut: There is a cut hole at the back of the cuff for connecting the headset/USB cable to the mobile phone. Reflective strips that remain visible in low light conditions.4. Sensitive touch: make full use of the mobile phone through the protective screen cover on the cuff, easily answer the phone, manage the playlist or activate the stopwatch without disassembly.5. Compatibility: There are four different sizes of this armband, which can be freely selected by you. Select products of different specifications according to the size of your mobile phone.