describe: Muscle massage (impact) fascia gun has an effect on the inner layer of muscle tissue and tendon. The set includes 4 massage heads that will affect specific muscle groups in the legs, buttocks, back, chest, wrists and ankles. With just 15 minutes of massage, you will get rid of discomfort and improve blood circulation. The efficacy of the massager lies in the method of vibration therapy, which combines a certain amplitude, vibration frequency and torque of the massage element. 4 types of massage: relax, rejuvenate, warm up muscles, relieve painIncludes 4 massage heads: spherical massage heads for back, buttocks, etc. (suitable for large muscle groups); U-shaped massage heads for neck, Achilles tendon; Conical massage head; Flat massage head is suitable for all parts of the body for relaxing massage. This product includes: muscle massager, 4 interchangeable massage heads, charger, instruction manual Recommended method of use: Massage suggestion: Shoulder 15-20 seconds. 3 times rest chest for 20 seconds. Step back for 30-60 seconds. Rest 3 times thigh, gluteal muscle 30-60 seconds. 4 times rest limbs 20-30 seconds. 3 breaks Specification: Rated voltage: DC8. 4VBattery parameters: 2000mARated power: 24WOperation mode: buttonGear: 1-6 gearBattery life: 2-3 hoursSize: about 23*22. 2*6. 5cm