"Multi-functional Tens Massager with 16 Preprogrammed Massage Modes for Pain and Muscle Relief. TENS unit help reduce pain and muscle spasms caused by a wide range of conditions including: arthritis, period pain, knee pain, neck pain, back pain, sports injuries. Its also used as a method of pain relief during labor. Tens muscle stimulator is a powerful weapon in your fight against chronic pain. Built in Powerful Rechargeable Lithium Battery Feature: 16 Choices 16 stimulation modes, you can choose between a diverse range from knocking, kneading, shiatsu and more. 16 massage techniques help to relieve pain, including shoulder, waist, back, buttocks, etc. (Pressing the "M" button to change the mode). Adjustable Schedule Timer& Intensity Create a scheduled timer from 10-60min by pressing the "T" button. And, the unit will automatically shut-off when the time is up. Also, there are 10 intensity levels, easy to adjust by pressing the "+/-" button to increase or decrease the intensity. 2 Outputs 2 outputs are isolated and has the same power, allow 2 sets of pads to be applied to the different areas at the same time. Also, you can share with your friends or family members to have a fantastic massage experiences together. Portable Compact size(9.5x5.0cm)and lightweight (only 52g) design, easy to carry, you can use it conveniently anywhere and anytime. Easy-to-view LCD Display: The LCD display with backlight provides better viewing at day or night. And, the battery indicator will flash when it need to recharge battery. Specification Material: ABS Shell color: white Display backlight color: blue Display type: LCD display Intensity: 20 levels (adjustable) Power supply: DC 4.5V 3* AAA battery (not included) Output frequency: 1 ~ 120 Hz Output pulse width: 100~250uS Output voltage: 40v20% Package includes: 1* Massager 2 Pairs* Electrode Pads 2* Connecting Cable 1* USB Cable & Adapter 1 * Acupuncture Point Chart 1* English User Manual