Product description:[list][*]Mimicking seesaw structure on the massage nodes’ design, the pillow massager provides a flexible kneading massage on your lower & upper back, as well as other body parts at a moderate pressure level.[*]Hands-free: The iBack2 can be attached to most chairs thanks to its stretchy velcro. Just sit and enjoy your massage without holding on to it![*]Gentler Massage & Heat: The seesaw-structured and rounded shaped massage nodes are more comfortable in design against the back, comparing to the old-school giant back massagers.