Use electric heating pads to relieve muscle tension associated with menstrual cramps, arthritis, injuries, and other ailments. Heat increases blood flow where applied, helping to dilate blood vessels improving circulation. The increased blood flow to a treated area can help soothe muscular cramping, spasms, and soreness. This Snailax heating pad is applying deep-penetrating thermal care and soothing massage onto your muscle, and it helps to improve blood circulation and to accelerate healing. Features: - Quickly heat, you can feel warm within 2 minutes - Two adjustable heating level available - Overheating protection system - Heating wrap pad is set with a auto shut off 30-minute timer - Vibration massager, built in 2 massage nodes to deliver relaxing massage. - 5 Pre-programmed vibrating massage modes for options - With magnetic clasp design to keep hands free, let you enjoy a relaxing massage during Working - Luxury velvet cozy cover -This neck and shoulder heated wrap envelops your entire upper body in its soft and smooth fabric that is comfortable to body touch. - UL approval 12V home adapter is included in the package, the adapter is safe to use with both 100-120V & 200-240V electric outlet.