Your chronic or acute muscle and joint pain doesn't care that you're busy, and it won't wait until you find time to get to a therapist's office. But like many others, you may be reluctant to be reliant on pain medication just to function. The Ultima OTC TENS unit is professional quality physical therapy equipment that you can use just about anywhere, meaning you can get safe and effective pain relief when you need it, no waiting for appointments or prescriptions. You'll get everything you need packaged with this unit, including: 4 reusable electrode pads, Lead wires, Batteries, and Carrying case. No need to be intimidated by a professional TENS unit like the Ultima OTC, we're giving you all the information you need with the included user manual and electrode placement guide. Below, we've also listed some additional information about the device that you might like to know. Specifications - Channel: Dual Output: Maximum 130mA (peak value) across 500 Ohm load Pulse Width: From 50 uS to 250 uS not adjustable Pulse Rate: From 1 Hz to 150Hz nonadjustable Waveform: Symmetrical, bi-phasic, rectangular, monophasic, rectangular.