Just select the painful area.. 19t will think for you ! Analgesic transcutaneous electrical stimulation unit (TENS). Large LCD display Dual intensity-independent channels Last used program loading 3 operating modes 8 programmes editable 12 programmes with graphical selection of the painful area Any parameters shown 3 selectable wave shapes Count-down timer with switch-off at the end Auto-switch-off if not in use Accumulation recording of the treatment time (in hours) Lock function