Memory Function: This TENS unit remembers the massage mode you used last, automatically restoring your preferred settings when powered on. Simply long-press the home button to activate the screen lock feature, which helps prevent accidental touches during use, allowing for a more relaxing muscle therapy experience.Adjustable 20 Intensity Levels & Timer: The rechargeable TENS device offers 20 adjustable intensity levels, enabling you to customize the frequency of electrical impulses to suit your needs. The built-in timer allows you to set session durations between 10 and 60 minutes, with a default setting of 20 minutes. A timer indicator keeps you informed of the remaining time. Equipped with a powerful built-in rechargeable lithium battery, you wont have to worry about unexpected power loss.What You Will Receive: 1 x TENS & EMS Machine, 4 Palm Electrode Pads, 2 Large Rectangle Pads, 2 Small Pads, 2 x 1/2 Lead Wires, 1 x 1/4 Lead Wire, 1 x USB Cable, 1 x User Manual, 1 x Pad Holder, 1 x Pouch, 12-Month Warranty, and access to our friendly customer service.8 Reusable Electrode Pads, 2 Outputs: The reusable electrode pads feature strong self-adhesive properties for improved performance and can be cleaned and reused up to 40 times for extended lifespan. The dual-output design allows treatment of two different body areas simultaneously or use by two people at once. This TENS unit is ideal for relief from back pain, sciatica, shoulder tension, and general muscle discomfort.Note: Intensity can only be adjusted when the port is properly connected and at least two pads are applied to the body. You will not feel the stimulation if these conditions are not met.