Tens 210The TENS 210 is an affordable two-channel battery-operated TENS unit that provides continuous, modulated and burst modes. Pulse frequency and width may be set independently. Each unit comes with a carrying case, set of four V-Trode™ self-adhesive electrodes, a 9 volt battery and instructions. The TENS 210 is easy to use, light weight and high quality. Soft Mettler blue colors is a nice change from the typical black color of today’s TENS units. The blue color makes the 210 easy to see from across the room.