The newest generation in the Interferential Device line, the digital BioStim INF has three pre-programmed sweeps; 1-10 Hz, used for Edema Reduction, 80-150 Hz used for Pain Relief, and 1-150 Hz for total treatment. Allows easy set up and patient instruction. 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.