ABRE HS-RL-DWA wireless door or window alarm in white, featuring a 120dB siren audible up to 1,300 feet (395 meters).The device is battery-powered, requiring four included LR44 button cell batteries, and offers versatile mounting options for either side of a door or window.It includes multiple settings for either alarm or chime modes and features a low battery indicator for increased reliability.Installation is simple and wireless, requiring no tools or wiring, and it works on both left- and right-side opening doors. GREAT FOR A CHILDS WINDOW!!! Or a door of a parent with kids. No getting out or in without an alarm to let you know!! You can NOT be safe enough these days… **NEW IN PACKAGE!!h