What You Receive2 x Main Machine, 1 x Charging Case( Allows selection of massage machine mode and intensity level), 4 x Electrode Pads, 1 x Charging Cable, 1 x User Manual. High-Quality Electrode PadThe Electrode Pad uses skin-friendly gel, the gel patch can be reused about 50 times. If the adhesive strength of the gel patch decreases, you can clean it with a little water, after drying it will regain its stickiness. Reducing the need for frequent replacements, maximizes the lifespan of the electrode pads. However, when the Electrode Pad is not sticky enough after cleaning, it needs to be replaced to avoid affecting the massage effect. Ease of Use with User-Friendly ControlsLuvan dual channel TENS machine, each channel operates independently, allowing you to target two different areas to customize intensity levels and mode. Not only can they massage your shoulders but also other painful areas at the same time. You can adjust it on the charging case, it has a display screen, all operations are clear. The tens machine even with concave and convex buttons for blind operation, quickly open your massage. Long-Lasting Rechargeable BatteryPowered by a high-capacity rechargeable lithium battery, and upgraded with a charging case. Single machines can run for 3h on a full charge and charging case can provide 3 times charging for two machines, total battery life is up to 12 hours. Let you enjoy a hassle-free experience. Wireless Operation, PortableYou can carry the wireless TENS machine anywhere, allowing on-the-go pain relief, without dealing with tangled wires. And light in weight, easy to carry. Convenient for use at work, during travel, or while engaging in daily activities. Optional 6 Modes 16 Intensity Luvan TENS EMS units programmed with smart, soothe, beat, scrape, knead, massage 6 mode, you can freely combine the different modes and intensities. The machine allow a gentle massage for relaxation or a more intense massage for muscle recovery. Intelligent 15min auto-off feature will automatically turn off when you're busy, avoid excessive. Your Personal TENS Unit MassagerThe TENS machine uses low-voltage electrical impulses to the nervous system to inhibit pain and release of endorphins. Which is beneficial for chronic pain and long-term pain management. Directly targets painful areas of the body for more convenient and immediate relief. Works effectively for variety of pain conditions, such as back, shoulder, waist and sciatica.