FDA Cleared 16 Modes TENS unit Rechargeable Pain Relief Machine Electric Pulse Impulse Body Massager About the product ✔The perfect PAIN RELIEF device by blocking the pain signal from nerves,it can help to ease the sub-health, relieve tiredness and shoulder tension, improve sleeping quality and activate collaterals to relief your body pain. ✔16 preprogrammed massage modes in a rectangle design: Knocking, Acupuncture,Cupping,Tapping,Shiatsu-Deep, Sensitive Parts Massage Mode .2-4 massage methods under each mode.16 modes totally. ✔Adjustable 10-60 minute timer by using "T" button,default timer: 20 minutes. 20 levels of adjustable intensity/strength. ✔Simultaneous dual output design for two person or two different body areas, you can use "+" button increases intensity or "-"button decreases intensity of mode. Allows 4 pads to be used at the same time,pls use 4 big pads or 4 small pads,not 2 big pads and 2 small pads.Tips:Used the pads on clean and flat areas,no sweat,no oil. ✔Easy to read animated backlit LCD Display,better view of the screen especially at night or in the dark light. Rechargeable internal lithium battery - up to 10 hours of continuous use.