Includes: 3 AA Batteries, 2 packages of four self-adhesive electrode pads,wires, lead wires, instruction booklet and more. Electronic Muscle massage uses very mild electrical current to exercise your muscles. Help to erase that muscle tension, headache, neck tension and foot discomfort. Small completely compact unit is easy to use. Dual Channel electronic massage unit can massage two muscle groups at a time. One Year Replacement Warranty.