This is the device that uses transcutaneous electrical nerve stimulation (TENS), electrical muscle stimulation (EMS), and infrared heat to help ease pain and improve muscle strength in the back and shoulders. The TENS therapy provides drug-free pain relief by stimulating the nerves and blocking pain signals to the brain, while EMS engages muscle contractions to accelerate strengthening and rehab. Each of the included pads contain four LEDs that emit deep red (660nm) and infrared (880nm) light waves that penetrate deep into tissue to help increase blood circulation, reduce swelling, and temporarily relieve joint pain. The stimulator has eight TENS modes, eight EMS modes, and multiple intensity levels which can be used together or independently. Includes remote and two sets of electrode pads. Charges via USB. Not for use by those with pacemakers.