[Wifi+Bluetooth Dual Mode] Connect to the network faster, 2 times faster than using Wifi alone (Bluetooth is only used for network signal connection, Bluetooth cannot be used alone. WIFI+Bluetooth is more stable) [Instant Notification] Push instant notification to your mobile phone immediately when the door or window is opened or closed. Keep informed at all times [Alarm Record] Supports viewing the opening/closing record and battery power on the app. Never worry about missing any important moments or running out of battery [Low Voltage Reminder] When the battery is low, it will automatically remind you to replace the battery, and you never have to worry about running out of battery [Smart Linkage] The wifi door magnet can be linked with other smart devices in the home to make your home smarter. Low advantage design to ensure long-term battery life. For example, when the door is opened, the light will automatically turn on. (Note that the light needs to be used with the WIFI switch) [Third-party voice support] This sensor supports for Amazon Alexa and Google Home Assistant [Easy to install] Small size, easy installation, adhesive installation, can be flexibly placed in various doors, windows, drawers, etc., without destroying the appearance and structure of the original furniture Specifications: Input voltage: 3V LR03 Quiescent current: ≤45uA Alarm current: ≤130mA Low power undervoltage: ≤2.4V Wireless network: 802.11 b/g/n Magnetic control distance: ≥15mm Battery: DC 3V LR03 (AAA battery, not included) Alarm method: Mobile phone APP notification push (Smart Life/Tuya Smart)