A/B DUAL CHANNELS TENS: You can set separate modes and intensities for channel A and channel B,and you can operate it with different intensity settings for each channel. Relax your body and have pain management anytime you feel the need with our NURSAL TENS electrotherapy pulse massager. 24 MODES CHOICES FOR PAIN RELIEF: NURSAL electronic TENS device has 24 user-friendly pre-promgrammed massage modes, making it much easier to use than other traditional electric therapy products. (The 24 sub-mode choices selection is under the 6 massage modes.) POWERFUL RECHARGEABLE BATTERY: No worries about treatment interruption for dead AA batteries any more! It can give you continuous use up to 20 hours! It can be connected to the wall charger, power bank or laptop USB port to charge. ADJUSTABLE TIMER & INTENSITY: The timer allows you to set a time of between 10-60 minutes, with the default set to 20 minutes. Twenty levels of adjustable intensity mean you’ll easily find one setting that suits your needs. This tens machine device is fully compliant with FDA standards. ENJOY WITH THE PORTABLE DESIGN: This NURSAL TENS unit device comes with a carrying bag, allowing you to carry it anywhere when necessary. It comes with 1pcs TENS Unit, 8pcs 2" Square pad, 4pcs 2"x4" Large pad, 3 Lead Wires, Pads Holder, USB Cable, Pouch, Cable Ties, User Manual