Battery Style: Non Rechargeable Battery; Timer Option: With Timer. Dual isolated channels. Pulse amplitude adjustable from 0-80 mA, 500 ohm load. Pulse frequency adjustable from 2-150 Hz. Pulse width is adjustable from 30-260 micro-seconds. Wave form: asymmetrical, bi-phase, square pulse. Modulation selector offers wave delivery in Normal, Burst or Modulation modes. Plastic belt clip. Comes complete with carrying case, 2 lead wires, 9-volt battery, 1 package of 4 pre-gelled electrodes and operating manual. 3 Year Limited Warranty.