BioStim® M7 TENS Device has seven programmable functions; Continuous, Width Modulation, Rate Modulation, Rate and Width Modulation, SD1, SD2 and Cycled Burst. The device has a Patient Lock System that, when activated prevents the patient from changing any of the set parameters. When the Patient Lock Systems is turned off, a Patient Compliance Meter is displayed showing how long the device was used. A timer allows the patient to use the device for a specified period of time. The two-channel device incorporates touch proof design and is run by two AA Batteries. Device comes with lead wires, electrodes (4), batteries, instruction booklet and carrying case.