PROFESSIONAL MUSCLE PAIN RELIEF MACHINEThis physiotherapy electrical stimulator can excite/stimulate sensory nerves and muscles, activate the specific natural pain gate mechanism and relax your body. It is mainly used for home electronic health massage to avoid the health condition of family members. 16 MASSAGE MODES This electric muscle massager adopts 16 user-friendly massage modes and pre-programmed and 20 levels of strength adjustment, giving you more choices to help relieve pain associated with sore and tired shoulder, lower back, knee muscles from exercise, household activities or normal professionals. POWERFUL RECHARGEABLE BATTERY This portable tens unit is built-in rechargeable lithium battery . It is designed with 2 charging methods: AC adapter (110-240V) or USB cable charging. After fully charged, it can be used continuously for 4-6 hours, and no longer worry about treatment interruption for dead AA batteries! PORTABLE DESIGNThis electronic pulse massager is perfect for back, joints , neck, knees, shoulders, ankles, legs, wrists and elbows. And it is light and small, and can be easily put in your bag, allowing you to carry it on the go and use it when necessary. It can be used freely in stores, hotels, offices, etc. 100% QUALITY ASSURANCEWe are very confident in the quality of this muscle stimulator ems dozens of units and offer warranty or refund for it. Please do not hesitate to contact us if you have any questions about your purchase. We will resolve your problem within 24 hours.