SunStim Pro Peripheral Nerve Stimulator Easy-to-read illuminated digital screen displays DBS, Twitch, Tetanus, TOF, current intensity and battery life Clearly visible, finger actuated front face membrane controls Ergonomic, compact shape fits comfortably in hand Removable silicone wrap enhances grip and helps protect the device Supplied with instruction manual, ball electrodes, 9v battery, 6' lead wires with alligator clips and protective wrap Side switch to increase and decrease level of stimulation Double burst: Two 60-ms bursts of 50Hz separated by 0.75s Twitch: 1 pulse per second Tetanus: 50Hz (50 pulses/s) or 100Hz (100 pulses/s) Built-in train of four: 4 pulses in a period of 2 seconds Stimulus pulse: Square wave monophasic pulses (200-μs duration)