Specification: Condition: 100% Brand New Item Type: Muscle Massager Material: aluminum alloy + silicone Color: Black Charging time: approx. 4 hours Physical stroke: 6 mm Interface type: Type C Maximum power: 70 W Nominal voltage: 12 V Power supply mode: lithium battery Battery capacity: 2500mAh Rated speed: 900-3200 rpm Usage environment: 0-40 ℃ Muscle massager size (with round head): Approx. 15 x 15 x 4 cm/5.9 x 5.9 x 1.6 inches Function: relieving muscle stiffness and sore muscles, improving blood circulation, improving soft tissue health of the body, and improving freedom of movement. Usage: 1. Press and hold the power, power and gear switch buttons for 3 seconds to turn on the phone. The indicator lamp shows the current battery capacity. 2. Briefly press the on, off and gear switch buttons, the machine starts to work, the display shows the current gear. The standard setting is 1 gear. Each time you press the button, the vibration intensities are increased by 1 gear. 3. Press the On, Off and Gear Switch buttons for 3 seconds to shut down the device. Use of 4 massage heads Spine Head: Used for spine massage and is irritating Round head: for full body muscle massage and relaxation Flat head: For relaxing large muscle groups, strong stimulation Bullet Head: Used to relax pain points and trigger points Package List: 1 x muscle massager 4 x massage head 1 x manual 1 x charging cable