Coupled with the iSmartAlarm home security system; Contact Sensors can be added to increase protection and notifications at doors; windows; liquor cabinets; refrigerators; or anything in your home that opens and closes. Contact Sensors come in a 2-pack and provide additional security for your smart home security system from iSmartAlarm. Contact Sensors are easy to place (battery-operated and attached with double-sided tape) at any door or window in your home to make sure you know when someone enters or leaves. With the CubeOne” communicating with your Contact Sensors (and other devices and sensors); you can customize settings such as door chimes and safety push notifications and the volume of the 110 dB siren that is built into the CubeOne”. Your CubeOne” will notify you immediately when a door or window is opened or closed.