BioMedical Life Systems Inc. INF Plus Interferential Device utilizes Microprocessor technology, with tolerance levels of less than 1%, this portable device incorporates a sinusoidal wave form usually found only in large Clinical Models. Three pre-programmed sweeps; 1-10Hz, used for Edema Reduction, 80 150 Hz used for Pain Relief, and 1 150 Hz used for Total Treatment allow for 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. The device has a timer for the desired treatment time, and operates on four AA batteries or an optional wall adaptor.