Muscle Therapy Device for Athletes Body Muscle Massager Handheld Massager 32 Adjustable Strength Levels 4 Massage Heads, Green Feature:  32 Strength Levels Free to adjust strength levels to give your muscle a deep massage, ideal for muscle recovery after exercise. Long Working Time With rechargeable large-capacity lithium battery, you can use it for a long time. Super Silent Designed with low noise motor, it produces noise under 45db, Feel free e it without worry about disturbing others. Auto Power Off This massager will automatically power off after 15 min to prevent injuries due to long-time use at the same part of the body. Comfortable Grip The handle of the massage gun is ergonomic and sweat-proof, non-slip, which is very soft and comfortable. Detachable Massage Head Our muscle massager offers 4 types of massage heads to meet the needs of different parts needed massaging. The massage head can be removed for easy installation and cleaning. Specification: Color: Black, Grey, Red, Green (Optional) Strength levels: 6, 32 (Optional) Interface: Type-C Material: ABS Output voltage: 7.4V Packing list: 1 * Muscle Massager 4 * Massage Heads 1 * Charging cable 1 * User manual