Portable Electric Muscle Massager Therapy Electro Shock Machine Back Pain Relief FDA-cleared TENS: It is compliant with CE, FDA and RoHS. Ease your pain without any side-effects by physical therapy instead of medication.Adjustable Time & Intensity: Adjustable 10-60 minute timer by pressing the "T" button. When time is up, the unit will automatically shut-off. There are 20 strength levels, adjustable by pressing the "+/-" button to increase or decrease the intensity steadily.Portable for Use Anywhere: Pocket-sized for convenient use anytime, anywhere. You can take it to the gym, the office or on vacation! Suitable for back, knee, shoulder, ankle, wrist and elbow pain relief.Easy-to-View LCD Display: This LCD display provides better viewing of the screen especially at night or in the dark. The rechargeable, internal lithium battery provides up to 10 hours of continuous use.12 Modes and 8 Reusable Pads: There are 12 pre-programmed modes to choose from for pain relief and 8 self-adhesive, reusable conductive pads. It's not necessary to use any cream or gel, and allows 4 pads to be applied to the two different targeted areas at the same time.Total body relaxation: Use for back, knees, shoulders, ankles, wrists, elbows, waist, neck and upper arms etc. Ideal for those experiencing back pain, arthritis, inflamed discs/joints, shoulder pain, body tension, injuries, chronic pain and more.The unit is pocket-sizedwith an easy-to-read LCD display for convenience of use, so that you can clearly see the massage mode, intensity and timer control currently selected. Get pain-relief anytime, anywhere. A/B Dual Channels - Allows for 4 pads to be applied to two different targeted areas at the same time. Dual channels allow you to cater to the unique needs of your muscles and customize your treatment using two different power levels simultaneously.Note:1.Pregnant women and hypertension patients should not use a TENS machine.2.This item is USB-chargeable. There is no adapter for this unit.3. At least two electrode pads need to be attached to the skin at any given time for the intensity function to be operable.