With the door and window alarm of the iSmartAlarm contact sensor, you know what is happening at every entrance to your house. This compact device is attached to both sides of your door or window and will notify you immediately when it is opened. In fact, this iSmartAlarm is ideal for cabinets. This means that you can use the contact sensor to monitor whether your child opens a cabinet with cleaning agents. This sensor is a completely wireless device and uses batteries to stay on. It is also easy to install these sensors using the supplied double-sided tape. In addition, this window sensor requires communication with the central CubeOne hub. The hub will be notified when one of these sensors detects a violation in your settings, which will trigger the CubeOne 110 decibel alarm.