The PCH Plus Digital Pulse Massager – Neck Combo Set is a dual-channel, battery operated muscle stimulation system that helps to relieve minor muscle aches and pains. This pocket-sized pain fighter features multiple settings and modes, a compact design, rechargeable internal lithium battery and 2 output channels. The 16 different massage modes stimulate tense and sore muscles by sending pulses through the included electrode wires and adhesive pads. You can independently set the modes of each of the electrode channels by using the 2 controls on the unit. Additionally, this combo set features a neck accessory that is designed to target tense, sore, or painful neck muscles. The accessory can also be used on the biceps or calves for additional relief.