What You Receive: 1 x AUVON 4-Channel TENS & EMS Machine, 10pcs TENS Electrode Pads (8pcs 2" x 2" Square Electrode Pads, 2pcs 2" x 4" Large Rectangle Pads), 4 x Lead Wires, 1 x USB cable, 1 x Pad Holder, 1 x Pouch, 1 x User Manual, our 12-Month Warranty, and Friendly Customer Service. 10 Upgraded TENS Machine Pads. The Low impedance Solid Gel has been upgraded to the industry leading American adhesive, which can provide much better self-stick performance and easy clean up after 45 uses for a longer lifespan. Standard 2mm connector lead wires & electrodes are classic and commonly used in the medical area, which makes it easier for you to find compatible accessories. Large LCD & Multi-Modes. A 3.69" large LCD backlit screen is used for this labor pain simulator and muscle stimulator with enlarged icons and buttons for much easier reading and operating experience! You can set working time for your TENS unit muscle stimulator from 10 to 90 minutes, which will sufficiently satisfy your massaging needs! With a built-in powerful rechargeable lithium battery, never worry about the suddenly power off!. TENS + EMS Unit. AUVON TENS & EMS device combines 2 therapies in 1 device, in which TENS is a electric muscle stimulator for pain relief which provides safe, non-invasive, drug-free methods and has been used by doctors and physical therapists for years. EMS brings elicitation of muscle contraction using electrical impulses and activates the muscles to assist in the increase of strength and endurance as a rehab and strength training tool. 4 Channel (A1, A2, B1, B2). Compared to dual channel TENS Unit, it allows you to apply up to 8 pads at the same time with the 4 outputs for much efficient pain relief. The independent A/B channel can work in different modes and different levels of intensities (e.g. you can select mode 7 with 3 intensity for your shoulders in channel A1 and A2, while in channel B1 and B2, this TENS machine can work as a back pain relief products in P3 with a much stronger intensity.