PROFESSIONAL PAIN RELIEF TENS MACHINE: Clinically-proven, physical therapists recommended drug-free back pain relief device as well as physical therapy equipment for aching and fatigue muscles in the shoulder, neck, sciatica, knee from exercise, normal household or work activities. 24 PRE-PROGRAMMED MODES: NURSAL ems muscle stimulator tens unit delivers 24 different massage modes and 20 intensity levels. The tens therapy unit modes are Kneading, Cupping, Acupuncture, Beating, Scraping and Taichi, offer more options for pain management. DUAL CHANNELS DEVICE: You can set separate modes and intensities for channel A and channel B, the stim machine last memory function will remember your preference of mode setting, you do not need to search from 24 modes again. Relax your body and have pain management anytime with NURSAL TENS electrotherapy pulse massager and accessories. 12PCS PREMIUM REUSABLE ELECTRODES PADS: The replacement pads come in 2 sizes (Large: 2"x4" 4 pcs, Middle: 2"x2" 8 pcs), allow you to cover different areas. With excellent self-stick performance, easy clean up and longer lifespan for up to 40 uses. WHAT YOU RECEIVE: It comes with 1pcs electric muscle stimulator, 8pcs 2" square pad, 4pcs 2"x4" large pad, 3 lead wires, pads holder, USB cable, pouch, cable ties, user manual, 12-month warranty, and 24-hours online friendly customer service.