-- [FDA-CLEARED WITH EFFECTIVE]: This pain relief device help to relieve the pain caused by nerve pain and cramps, increase blood circulation, relax stiffness muscles, reduce swelling, and body fatigue. All you need to do is place the electrode pads on the areas of your body where you are experiencing pain and start at a low intensity, then gradually build up the intensity to get the muscles contracting. -- [25 MODES AND 50 INTENSITIES]: The Tens Unit Muscle Stimulator has 25 massage modes and 50 kinds of electromagnetic wave intensity with the continuous adjustment until you feel comfortable. Different impulse massage mode will improve the different symptoms for your body (5-60 minutes automatical time set). -- [SUPPORTING 2 PEOPLE USE]: This muscle stimulator built with separate modes and intensities for channels A and B. For example, you could choose Acupuncture mode in channel A with an intensity level of 17 for your shoulder. While in channel B, another person chooses the Thumping mode runs with the intensity level of 8 on the lower back as a back electric stimulator. -- [POCKET SIZE AND RECHARGEABLE]: self-adhesive conductive reusable pads, building with rechargeable Lithium Battery and colorful HD screen to use by middle-elderly easily, relaxing your muscle with non-drug anytime anywhere Applicable areas: neck, waist, legs, back Power mode: USB, Shell material: ABS Qualification: CE; ROHS; FDA; MDD Function: 25 massage techniques, 50 levels of force, water washed dust-proof electrode pads Patch size: 9 * 5.8cm, 1A5V