Relax: Features six different speeds - start slow and relax or pump the speed up to really get into those pesky knots! Battery: With a lithium 1800mAh battery. Function: Can help to circulate blood, loosen stiff joints, and soothe sore muscles. Great for back and neck pain relief when used correctly. Massage Gun: Get a mini USB charging massage gun. Specifications: 900-3200rpm frequency, max 125W power, and 5V charging voltage. Colours: Available in black, pink, green, white, and red. Mini Usb Charging Massage Gun | Living Social | Living Social