Features 1. Use it Anywhere: This TENS unit massager machine relieves lower, mid, and upper back pain from sciatica, arthritis, muscle tension, inflammation, and injury by delivering nerve stimulation through gentle electrical pulses. 2. 8 Modes and 19 Intensity Levels: The tens-unit muscle stimulator provides 8 modes and 19 intensities to meet different needs. The 15-minute auto-off feature automatically turns off when you're on the go, preventing overtreatment.better for back, neck, leg pain. 3. Built-In Powerful Rechargeable Battery: The wireless tens unit muscle stimulator for pain relief therapy can be easily powered by any wall chargers, power banks, laptops and USB adapters. Built-in batteries provide long-lasting power for a variety of purposes. 4. Your Best Tens Unit Pulse Massager Choice: Looking for a way to maximize your fitness without shelling out for expensive appointments Are you dealing with regular muscle pain or discomfort that interferes with your active life-style Often feel tired when working and traveling This Pulse Muscle Stimulator for Pain Relief is just what you need! 5. Easy to Use: One key to start, put your finger on the power switch button in the middle, press and hold for 3 seconds to start the machine, then you can press and to increase the pulse intensity. You can also briefly press the power switch button in the middle to switch modes while the machine is running. Specification Material: PU, PET Color: Black Size: 17.5 X 6.8 cm Weight: 100 g Package Include: 1x Muscle Massager 1x Charging Cable or 2x Muscle Massager 1x Charging Cable or 3x Muscle Massager 1x Charging Cable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store