Includes: Device batteries lead wires 1-4pack of electrodes carrying case and users manual * Channels: Dual Channels Isolated between channel * Wave Form: Asymmetric biphasic square pulse * Amplitude: 0 to 15mA each channel adjustable (500 ohm load) * Pulse Width: Variable 60-250 microseconds adjustable * Frequency: 2 to 150 Hz adjustable * Uses 4 \'AAA\' batteries (included)