It says it's waterproof, but I've noticed that it fogs up even when I sweat. If I wash my hands several times for 8 hours, some water gets in and they stop working. So you need to remove the backing and let it air dry (it will start working in an hour as it dries very quickly). To remove the back there is a small notch in the top right corner and just take a key or whatever fits in and gently lift and it will come loose. It is suitable for both teenagers, women and men. The battery lasted 6 months.
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