Normatec Arm Attachments do not include a control unit. It includes a pair of arm attachments only. Attachments are compatible with Normatec 3, Normatec 2.0 and Normatec 2.0 Pro control units. Boost your performance with the Normatec Arm Attachments. These arm attachments provide a dynamic air compression massage that is used to advance your wellness, recover faster, improve your training and maximize your performance. The patented precision pulse technology helps to increase circulation, revive muscles and reduce swelling to keep your body strong. There are seven different levels of compression that deliver precise, tension-relieving massage treatment to five overlapping zones on your hand, arm, forearm, elbow, upper arm and shoulder. The elastic band and adjustable buckle hold the attachment to your body hands-free. This recovery system works with the Hyperice App that gives you curated routines, or you can choose your own settings with adjustable time, pressure and ZoneBoosttrade options for a customized massage. Get the ultimate arm massage to warm up and recover better with the Normatec 3 Arm Attachment.