Features： 1、Powerful Rechargeable Battery: After charging, it can be used continuously for 4?6 hours, with 2 charging methods, AC adapter (110?240V) or USB cable charging. 2、Adjustable Timer and Strength: 20 levels of strength adjustment, 20 minutes system default massage time, 10?60 minutes massage time can be adjusted. 3、4 Channels TENS: 4 output ports, independent output, when used by multiple people, massage mode and strength can be individually adjusted. 4、16 Massage Modes: 16 user friendly and pre promgrammed massage modes, making it much easier to use. 5、Wide Range of Uses: Mainly used for home electronic health massage to prevent sub health of family members, and can also be used in shops, hotels, offices, etc. Specification： Item Type: EMS TENS Muscle Stimulator Voltage: 110-240V Working Principle: Rechargeable pulse massager adopts physical massage principle of electronic acupuncture and uses low frequency pulses to imitate 16 basic techniques of acupuncture massage. Use Range: (1) This product is mainly used for home electronic health massage to prevent sub health state of family members (2) Scope of Use: Homes, business gifts, shops, hotels, offices, etc. Power Supply Mode: Lithium Battery Battery Capacity: 300mAh (Include with Battery) Package List： 1 x Host 4 x Electrode Wires 8 x Electrode Pads 1 x Power Cord 1 x Plug 1 x Manual 1 x Acupoint Map 1 x Wire Wrap Board