6-DIGIT PROGRAMMABLE TIMER/ MULTI-SIZE OPTIONS We have tiny, small, medium, large and giant gym timer models to be used for any Cross Fitter who wants to do workouts on vacation, at commercial gyms, or at home! POWER REQUIREMENTS Large and giant wall timers for commercial gyms are mainly connected to the power outlet. For garage or home gym, portable mini interval timers are rechargeable with built-in battery. Timer will last around 10 hours when full charged in 3 hours, suitable for free exercise anytime, anywhere. SYNCHRONIZING Feature Portable, stand on table, wall mounted, hanging ceiling. APPROVALS UL listed, CE, ROHS, Warranty 2 years against our timer and workmanship, offer factory repair service. Service OEM &OEM, Drop shipping