muscle pain and sorenessMETAL MATERIAL and LIGHTWEIGHT - The case is made of metal, handheld comfortable and weight only 1.1 pounds but powerful, it's light, easy to hold, and can go with you anywhereINFINITELY VARIABLE SPEED – Cordless rechargeable power with 5 adjustable speeds between 1,800 and 3,200 RPM, with 50 lbs of pressure, 12mm of stroke amplitude, with dual voltageSUPER LOW NOISE - Adopts brushless motor and high quality bearing for an almost drop-dead silent massage to use in the office or gym without causing a disturbanceLONG BATTERY LIFE ‐ 2600mAh high-quality rechargeable lithium battery, ensures a 4 hours working time(low speed) per full chargeMassage Gun helps stretch recovery through vibration equipment, which can deeply relieve muscle stiffness and soreness and increase blood circulation. It is suitable for athletes, fitness enthusiasts, office workers and the elderly. Get a better relaxtion after exerciseNotes1. Do not impact joints2. Don't stay in the same location for too long3. Please refer to the instruction manual and schematic diagram for proper use.4. Please long press the power on button for 1 second and power off.5. If there is an error, it is because the protection device is activated, please restart it.Massage HeadsBall Head - For bulk muscle groups,like waist,back,buttocks,thighs,calvesStraight Head - For impacting deep tissues such as merdians,jointsFlat Head - For back bulk muscle groupsD-Shaped Head - for abdominal muscles,neck,spine,AchillesTechnical Specifications:Power: 15WBattery Capacity: 2600mAh 10.8VCharging Time: 5- 6 hoursWorking Time: 4 - 8 hoursAdjustable Level: 5 levelsFrequency: 1800 - 3200 rpmNoise Level: 45 - 52dB Package Dimensions8.46 x 8.27 x 2.76 inches; 1.1 PoundsItem Weight1.1 poundsManufacturerO'Bella1 x Massage Gun5 x Massage Heads1 x USB Charging Cable1 x Travel Case1 x User Guide