The Fetish Fantasy Series Shock Therapy Electro Touch Cuffs can be a joy to play with alone but they can be sensational when used by a couple. Each can wear a cuff or one can dominate the delivery of the sizzling e-stim shocks. The black vinyl cuffs wrap around the wrist and they are connected to a power unit where you control the jolts. You can even get rid of the cuffs and wires so you can use the power unit to deliver the e-stim directly. Item length is 3.5 inches and item width is 1.5 inches. Single 3V CR 2032 battery is not included.