The At-Home Digital TENS unit is perfect for home use as it is an over-the-counter TENS unit that is cleared by the FDA. Easy-to-use, this TENS unit is the preferred doctor's choice for effective pain relief. It features a digital processor that is both accurate and precise. It can store 60 records for up to 999 hours and automatically shuts off when not in use. The prominent dual channel allows the user to be able to use either two or four electrodes at a time. The pulse rate that is adjustable from 2 to 150 Hz and has 6 modes to choose from (Burst, Modulation, Constant, MRW, SD1 and SD2). The various modes can be paired with a timer. Time your therapy electrotherapy sessions from 5 to 60 minutes. This device is powered by an included 9-volt battery. Also included with this device is one pair of lead wires, four self-adhesive reusable electrodes, hard plastic carrying case, quick start guide and instruction manual.