Dual channels with fully adjustable parameters. One mode of operation: normal (N) for continuous output. The timer is adjustable in 30 min., 60 min., or constant time. Dual isolated channels, two leads per channel.Pulse amplitude (constant current): Adjustable 0 - 80 mA, 500 Ohm load.Pulse frequency: Adjustable 2 ? 150 Hz.Pulse width (micro seconds): Adjustable 60-250 us.Mode selector: Burst (B), N (Normal), or Modulation (M).Timer adjusts for 30 minutes, 60 minutes or constant.Requires 1 9 V battery which lasts approx. 70 hours.Comes with a carrying case, 2 dual channel lead wires, 9V battery, 4 reusable electrodes, and manual.1 Unit.