●One-piece shape, comfortable to carry: compact design, convenient to carry ●Always and flashing 2 modes: different modes must be selected according to your needs ●Waterproof and durable, strong usability: silica gel material ●FULL COVERAGE VELCRO CLOSURE: the velcro on the back is more ●Related battery: the product contains CR2032 button battery, usage time is approx. 100 hours