The Device offers bipolar stimulation using two electrodes where the interferential stimulation is already "mixed" or Full Interferential stimulation with the use of four electrodes. Waveform is pulsed sine, with a pulse width of 125 microseconds for each phase. Features four frequency shifts: continuous, 1-10 Hz over 6 seconds, 80-150 Hz over 8 seconds and 1-150 Hz over 10 seconds. The device has a low battery indicator, a timer for the desired treatment time and operates from four AA batteries (included) or the BioStim® Wall Adaptor (not included). Includes carrying case and instructions. Measures 3.25" x 2.25" x 1 5/8"; weighs 8 oz. 3-year limited warranty.