The SunStim™ Pro Peripheral Nerve Stimulator delivers reliable, adjustable current in one-second twitch pulses. Features  built-in train of four with four pulses per two seconds. This deluxe nerve stimulator is ergonomically designed with a  digital screen for quick visual assessment of functionality. Also includes a removable silicone case. Comes complete with  instruction manual, ball electrodes, 9V battery, 6’ lead wires with alligator clips and gray silicone protective wrap.