A dual channel, four pad TENS unit. Comes in the standard model, with a single continous mode, an the deluxe model, with an automatic timer (30 min, 60 min, and continuous) and three modes (Burst, Modulation, Continuous). Comes with all needed accesories: Multi-day self-adhesive electrodes - 3 packs of 4 electrodes (12 total) One 9-volt battery Lead wires A chart and written directions on where and how to use the unit and where to place the electrode pads A hard plastic carrying case Features an adjustable pulse rate and pulse width. Pulse rate control 2 - 120 Hz Pulse width control 40 - 160 uS Size: 23 x 64 x 91 mm Weight: 130 grams Battery Life ~ 100 hrs at normal setting Voltage: 1-110 Volt 1 year limited warranty. Doctor's Prescription REQUIRED for this item. Please fax to (888) 280-0299 TN01$49.95Model: VITAL TENSVITAL TENS DELUXE (+30)