Specification: Input voltage: AAA1.5V×2 Current: Less than 8μAAlarm Current: Less than 70-120 mA WiFi: 2.4GHz IEEE 802.11b/g/n Magnetron distance: Less than 10 mM Working temperature: -10°C-50°C Package Included: 1 * wifi door/window sensor (without battery) Receive Real-time Alarms Remotely: When door/window is opened or closed, the sensor will push instant notification to your smartphone immediately. so you don't have to worry about your baby going out of house without notice, will easily know when your aged parents leave or arrive home and even can be clear when someone enters your home,shop,office ,etc Compatible with Google Play,Andriod and Ios System: No hub required and No fees charge. Convenient for you to detect the status of your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed Alert message push: Protect your home with open / closed door detection. When the door / window is triggered, you will receive an alarm signal from your phone. Home Security Alarm make House more safety Easy Installation：No Need to use complicated tools when installation,just use 3M glue to install,firm and durable.The two arrows are opposite,the distance between the two compopents should be as close as possible,and the closest distance should not affect the opening/clsoing of the door or window Low Power warning: The sensor door need with TWO AA Batteries(not include).When the battery level is low, it will automatically push messages throuch APP to remind you to change battery, never worry about running out of battery