Merach rechargeable muscle massage device Sports whole body massageradjustable speed levels: 1200 3300 percussions per minute, you can adjust the massages rotating speed to meet reach the most comfortable state. 6 massage adapters: You can massage any part of your body with four replaceable massage heads. 4 6 hours working time: 2500mha rechargeable lithium ion battery supports about 4 6 hours of use per chargeMore smooth and ultra low noise: high precision mould makes the machine head and the body tightly connected,