CURRENT SOLUTIONS best valued digital TENS unit on the market. Over the years it has proven to be the most durable and easy to use TENS unit. The upgraded digital processor in the 2nd Edition is more accurately precise and has established itself as the preferred doctor's choice for effective pain relief. Dual Channel for use with 2 or 4 electrodes 5Modes Burst Modulation, Constant, MRW, SD, Bi-Pulse 100 mA maximum strength amplitude Wave Form Asymmetrical Bi-Phasic Square Pulse Timer 5 to 60 Minutes auto shutoff or Continuous Compliance Meter 60 records up to 999 hours