waterproof case features link to arm, prevent mp3 from water 100%, listen to the music when it is inside,convenient to carry. waterproof wrist case for ... arm strap, and is guaranteed submersible to 19ft / 6m.This waterprof case is specially designed to protect your mp3, but will also ... can also bound in the arm by the belt.Constructed from soft matte PVC, Features a transparent frontage, and seals ...