AccuRelief Electrotherapy Pain Relief Mini TENS Unit, Single Channel. Pre-programmed with two phases of alternating therapy. 15 levels of adjustable intensityincrease or decrease stimulation with the press of a button. Lightweight, fl exible design shapes and contours to almost any body part. 20 minute treatment with auto shut-off. Odor-free, drug-free, latex-free. 2 replacement pads included.