Smiledrive Door Window Open Alarm Smart WiFi home Security System is an ideal security system for your home, office, garage, shop, warehouse, etc. This Door Lock Sensor can be connected to local WiFi and sends you a notification on your smartphone app whenever the door or window is opened or closed in your absence, sounds a loud 120dB siren (when armed) easily audible up to 10 meters. It has 2 Arming modes that can be set as per requirements with the device or remotely through App compatible with all Android and IOS systems. This Smart Door Sensor runs on 2 AAA Batteries keeping you alert and notified up to 1 year and also automatically push messages through APP to remind you to change batteries.