Features: Powerful and rechargeable - can give up to 12 hours of continuous use on a full charge! TENS unit: Get a 16 mode TENS unit muscle stimulator. 16 modes: With 16 modes for pain relief including Knocking, Kneading, Thai massage and more Benefits: Can help with pain relief and pain management on muscles and joints including sports injury, knee injury, foot, hip, arthritis, or tennis elbow. Two outputs: Both outputs 'A' and 'B' have 100% power - meaning the strength won't be cut in half. 20 intensity levels: Includes 20 levels of intensity - output of 'A' and 'B' can be individually adjusted. | TENS Unit Muscle Stimulator | Wowcher