Keep your workouts safe and worry-free with this essential safety key designed specifically for King Smith WalkingPad R1, R2, and X21 treadmill models. This replacement safety key features a durable black strap with a secure clip attachment and a distinctive red magnetic head that connects firmly to your treadmill's console. The adjustable strap clips easily to your clothing while exercising, providing that crucial emergency stop function if you should stumble or fall. The generous strap length allows for comfortable movement during your workout without restriction. Built for reliability, this safety key is an exact fit replacement that ensures your treadmill's emergency stop system functions as intended. Don't compromise on safety - this key is an essential component for anyone using these WalkingPad treadmill models for their fitness routine.