4 IMPROVED MASSAGE NODES - with superior deep massage capabilities target hard to reach musclesHEATED MASSAGE - for relaxing warmth that loosens muscles and enhances therapeutic valueBI-DIRECTIONAL MOVEMENT - mimics the motion of in-person massage without the costMULTI-POSITION CAPACITY - allows you to target your neck, waist, shoulders, or backThe product must be plugged in to be used. The massager won't be able to turn on without a source of power. This isn't a chargeable device and contains no battery in the product, it must be plugged in to be used.