1 control unit. 1 preloaded battery. 1 reusable electrode pad. Tens therapy. Blocks even chronic pain signals. No. 1 pharmacist recommended tens device. Relieves painful muscles and joints. Same technology used by doctors. Reusable, wire-free and easy to use. Customizable: 63 intensity levels. Prescription strength. Powerful, portable pain relief. Relieves even chronic pain. For tough or persistent pain, it's often difficult to find relief. Now you can get the same Tens technology used by your doctor, for a fraction of the cost and without a prescription! For persistent sore or aching muscles. For relief of chronic pain associated with arthritis. Convenient: Preloaded battery for instant use. Safe & Effective: Drug free. Blocks pain signals at the nerves. Energy Saving: Automatic shut-off after each 30-minute session. Reusable: Control unit, electrode pad and battery are all reusable. Discreet & Portable: Use while doing normal activities. Personalized Relief: Intensity is adjustable (63 levels). For More Information: Visit SmartRelief.com; Scan QR code for video explanation. Pain Therapy Kit Compatible with: back & hip; knee & shoulder. www.icyhot.com. What is Tens Therapy? Tens stands for transcutaenous electrical nerve stimulation, a method that was once only available to doctors and physical therapists. Smart Relief TENS Therapy is applied right to the point of pain to safely and effectively send gentle waves of relaxing pulses to the underlying nerves that are affected by pain. What does it feel like? Smart Relief is fully under your control, with 63 gradual intensity levels so each session is customized. Simply dial it up or down to get exactly the relieve needed. Most users experience a mild tingling sensation or a slight warming around the treatment area. Begins blocking pain immediately and provides relief even after you turn it off. Easy to Use: No wires. No assembly. No doctor needed. Wire-free device can be used on the go. Feel it begin working at the touch of a button. Strength/intensity is adjustable (63 levels). Detailed quick start guide included inside. Adjust the intensity level up or down until you experience optimal relief. Therapy System Includes: Control Unit: Reusable (with preloaded battery - 3V CR2032); Electrode: Reusable (Refill pads sold separately). Length of time each lasts varies widely depending on use, body type and care. See quick start guide and instruction manual for detailed instructions. Made in Thailand and China.