This easy-to-use, portable TENS unit features Electrical Muscle Stimulation (EMS) and TENS for effective, drug-free pain relief. The rechargeable, wireless electrical stimulator comes with a remote control plus one large and one small reusable pad. Great to use on your back, shoulders, waist, legs and arms, it produces a stimulating, pulsating massage that helps prevent pain signals from reaching your brain. It can also be used to relieve pain associated with arthritis. Customize your use with 4 pulse modes and 20 levels of intensity. Includes a 30-minute fixed timer with auto shut-off. Includes 1 CR2032 battery and 2 "AAA" batteries. Plastic. 9"L x 5"W. TENS Unit + 2 Pads.