Ultima TENS unit is a 5 mode device featuring dual channels and 3 wave forms used to emit electronic pulses to treat body pain. Offers 20 treatment modes. Provides gentle electronic stimulation. Can be used to treat neck, lower back, and knee pains as well as other conditions. Isolated between channels. Max pulse amplitude is 130 mA. Emits adjustable pulse frequency from 1Hz-150Hz. Pulse width varies from 50-250ﾵ. Continuous pre-set timers include 15 min, 30 min, 45 min, 60 min, and 90 min options. Includes asymmetric pihasic square wave forms and symmetrical biphasic rect., asymmetrical biphasic rect., monophasic rectangular pulses. 12 preset modes for treatment. 9 volt battery. A successful solution for short-term pain relief.