The 57A00-1 Vanishing Door/Window Transmitter is an ultra-thin (1.5”H x 1”W x .38”D) supervised wireless contact. It has beveled edges that vanish into any décor. It also features a bypass button that allows you to manually bypass the transmitter, which automatically restores when the magnet is replaced. Requires a Leviton Security & Automation 64 Zone Wireless Receiver (Leviton Security & Automation part #45A00-1). Uses CR2032 lithium ion battery, included. Leviton’s wireless products use 433Hz frequency and require a Leviton Automation system.