Dozens of pain relief machines. The TENS unit sends electrical current through wires to pads placed on your skin to relieve body pain such as back, knee, shoulder, neck, and elbow pain; improve sports injuries, arthritis, and sciatica; stimulate muscles, improve blood circulation, relieve fatigue, boost immunity, and improve sleep quality. Tuina, acupuncture, shiatsu, rubbing, vibration, pinching, foot reflexology, and ear kneading options help reduce the sensation of physical pain such as sciatica, arthritic or inflamed discs/joints, stiff shoulders, and lower back pain. 16 modes help relieve body stress and pain for a healthier, more energetic experience. 20 intensity levels allow you to fine-tune the pulse width and pulse frequency to optimize sensitive control to soothe your specific pain; a pre-programmed timer allows you to set a preset duration from 10 to 60 minutes. Animated display on the LCD screen. massage mode, intensity, and treatment time. Built-in timer from 10 to 90 minutes, default timer: 20 minutes. When it is time, it will automatically power off. Specification: Battery capacity: 200MA Curing time: 10-60 min Output frequency: 0-104Hz Input voltage: AC110-240V Output pulse width: 80us Working temperature: 5-40 Adapter output voltage: 5V Working humidity: