Features： 1、4 VIBRATION MODES: Muscle massage machine has 4 adjustable vibration modes, so you can choose different strengths according to your tolerance. 2、DEEP RELAXATION: Percussion massager can relieve muscle fatigue and soreness, reduce the risk of sports injuries, and improve athletic performance. 3、MULTI PART APPLICATION: Body massager is applied to all parts of the body, such as calves, thighs, arms, shoulders, back, etc. Suitable for people of all ages. 4、1200MAH BATTERY: Built in high capacity lithium battery, lasting 4-5 hours, rechargeable design, to meet your various massage needs, suitable for home, office and gym. 5、PALM SIZE: Small in size but powerful, only the size of the palm, even women can also be operated with one hand. Portable design, can be carried around. Specification： Item Type: Muscle Massage Machine Material: ABS Built In Battery: 1200mah lithium ion battery Gear: 4 gears Package List： 1 x Muscle Massage Machine 1 x Charging Cable 1 x Instruction Manual