The XPO2 offers high quality stainless steel backing 2 outputs 6 massage modes and an internal rechargeable battery * Dual channel battery operated massaging muscle stimulation system that helps to relieve minor muscle aches and pains * Included in this package: dual channel unit 1 set of large single sided adhesive electrode pads 2.5 1 set of small single sided adhesive electrode pads 1.75 electrode wires USB cable AC adapter instruction manual * Features: large LCD display adjustable timer 2 outputs 6 modes rechargeable internal lithium battery 20 intensity level settings * Sold over-the-counter - no prescription needed