Packing list: 1x massage gun. 4x massage head. Product parameters: *Material:Shell: 100% ABS handle: 100% silicone *Charger. Vibration frequency: 50-60Hz. Input voltage: 110-240V. API type: DC,26V=1A. *Battery. DC input: 8.4V/1A. Type: high energy lithium battery. Battery capacity: 2000mAh. *Massage gun. Speed: 1200-3300 rpm. Rated power: 24W. Rated voltage: 7.4-12V. * 6 gearshift adjustable, up to 3200 times / MIN of deep massage, release fatigue, relieve muscle soreness. * 1 gear: 2200 rpm. * 2 gear: 2400 rpm. * 3 gear: 2600 rpm. * 4 gear: 2800 rpm. * 5: 3000 rpm. * 6 gear: 3200 rpm. * shoulder muscles: 15s ~ 20s x 3 times. * chest muscles: 30s. * back muscles: 30s~1min x 3 times. * gluteal muscles: 30s~1min X 4 times. * Lower limb muscle group: 20s~30Sx 3 times. * Please do not use overtime. If you feel uncomfortable, please stop immediately. For more information on how to use it, please read the instructions. Please Note: 1. Do not touch or press the massage head while running. 2. Do not impact the joint, fascia relaxation gun is generally only suitable for muscle and soft tissue, if the direct impact on the joint is about the same as directly knocking the joint on the stone, it is easy to cause joint injury. 3. Not all parts are suitable for use. Fascia guns are not recommended at all for muscles such as the neck, chest, abdominal cavity, and armpits that are thinner and lean into organs and aorta. 4. It is not that the longer the time is, the more painful it is, the more effective it is. The use of body sensation should be kept at 6-8 points, and the use time of the same position should be controlled within 1 minute as far as possible. 5. Do not use young babies, minors, pregnant women, people with pacemakers, fractures or metal contents in their bodies.