The TENS 3000 from Roscoe Medical is a Dual Channel, three-mode analog TENS therapy unit with built-in timer. This user-friendly, exceptional quality TENS unit boasts the latest in microprocessor technology, featuring precise dial and timer performance. A Safety Amplitude Cap comes standard, which closes the amplitude knobs to protect the user from accidental knob movements that may result in jolts of power. Features 30 and 60 minutes or continuous timers. Pulse Rate: 2-150 Hz.