The N404 SD TENS is a battery operated pulse generator that sends electrical impulses electrodes to the body and reach the nerves causing pain. The device is provided with two controllable output channels, each independent of each other. An electrode pair can be connected to each output channel. The electronics of the N404 SD TENS create electrical impulses whose Intensity, duration, number per second and modulation may be altered with the controls or switches. Dial controls are very easy to use and the slide cover prevents accidental changes in the setting. Channel: Dual, isolated between channels Pulse Amplitude: 0-90mA peak to peak into 500 ohm load Pulse Rate: Adjustable, from 2Hz ~ 150 Hz Pulse Width: Adjustable, from 50 µs ~ 300 µs Mode: B, C, M, MM, MR, SD TIMER: C, 15, 30, 60 Minutes Wave Form: Asymmetrical Bi-Phasic Square Pulse Voltage: 0-50 V peak into 500 ohm load Size: 95(H)X 65(W) X 23.5(T) mm