The TENS 3000 uses a microprocessor which gives exact dial performance and are as accurate as a digital unit, yet easy to operate. Benefits include maximum full strength power of 80 mA. The safety amplitude cap protects the amplitude knobs from accidental bumps or knob movements.- Analog Unit, System Includes: Lead Wires, Four Self-Adhesive Resusable Electrodes, 9-Volt Battery, Carrying Case, and Manual, Basic Assembly Required, 1 Year Warranty (092873) 14-21 Days