IMMEDIATE PAIN RELIEF: With 24 program choices and 20 intensity levels, this device helps reduce pain and muscle spasms caused by arthritis, period pain, knee pain, neck pain, back pain, sports injuries, and more. GET IMMEDIATE PAIN RELIEF: WITH 24 CHOICES AND 20 LEVEL INTENSITY,Reduce pain and muscle spasms caused by a wide range of conditions including arthritis, period pain, knee pain, neck pain, back pain, sports injuries. A/B DUAL INDEPENDENT CHANNELS: Control 2pcs/4pcs/6pcs TENS unit pads for targeted pain relief: You can set separate modes and intensities for channel A and channel B. 14pcs & Different Size:Stick pads on anywhere as you need. IMPORTANT USAGE INSTRUCTIONS: Before using the TENS unit, refer to the user manual. Remove the protective film and ensure the pads are applied to your treatment area before turning the device on. Set the working time between 10-60 minutes by pressing the circular button in the middle. Follow these steps for safe and effective use every time. MEGA SERVICE: Enjoy 24/7 live chat support and a free upgrade to our full replacement guarantee. We treat you like family and want you to be 100% happy! If you have any questions, our wonderful team is always here to help.