Accuracy at your fingertips! Handheld dual channel, 4 lead TENS with large 2 LCD screen and digital keypad, alleviates chronic, post surgical and acute pain. FeaturesThrough constant current, the intensity is adjustable from 0-98 mA Patient lock/compliance meter Timer Pulse width ranges from 10-250 microseconds4 Pre-programmed and Programmable Protocols Continuous Width Modulation Burst Cycled Burst Includes Four electrodes Two 48 lead wires 2 AA batteries Carrying case 3-year warrantySpecificationsSize 3.9 x 2.75 x 1 Weight 4.9 ozChannels 2 Waveform Asymetrical, biphasic square-waveIntensity Continuously adjustable from 0-98 mA peak Frequency 1-150 Hz Impulse Width 10 250 microseconds s adjustableModes C Continuous Continuous stimulation M1 PW Modulation Decrease/increase of set width of 50% over a five-second period B1 Burst1 0.5 seconds on, 0.5 seconds off. Adjustable pulse rate from 1 150 Hz.B Cycled Burst 8 pulses per burst/2 bursts per secondPower Supply 2 AA Batteries 1 Each / Each