4-IN-1 MachineThe Xpainoff TENS EMS Unit Muscle Stimulator is a leader in physical therapy equipment and pain relief device loved by consumers, which providing immediate and lasting drug-free muscle pain relief from back pain, neck pain, tennis elbow.A/B Channel independent control You can switch the different channels at will through the A/B button. For example, when you select the TENS Unit module through channel A and adjust mode & intensity to relieve arm pain, you can also select the EMS Unit module through channel B to massage your shoulders. This also means that two people can experience it at the same time.RechargeableLet's forget about AA batteries, the upgraded built-in & rechargeable lithium battery allows the tens machine to last longer and make your experience more comfortable.Large & Clear DisplayThe upgraded muscle stimulator machine is equipped with a 4*6 inch LCD screen to display user-friendly 4 major function modules and 36 modes, support to adjust time and intensity. Even the large buttons are designed for every elderly user.Upgraded Accessories Every machine prepared with 6pcs electrode pads, featured premium self-stick performance and used about 45 uses for a long lifespan. Meanwhile, the patented small ear design allows you to easily remove the pads and wash them without leaving solid gel on your hands.