Pain-Free Living with a TENS Unit! MStim Reha LGT-231 is the most versatile TENS unit for relieving painful, stiff, or sore muscle and joint pain. It is perfect for individuals who experience arthritis pain, lower back pain, neck pain, fibromyalgia, etc. The device is pocket-size, lightweight, and battery-operated, you can use it at home, in the office, or anywhere you are on the go. Highlights 2 channels Pocket-size, lightweight, battery-operated Intuitive App control Preset protocols with pad placement guidance Certification: CE, FDA, Health Canada