Wifi Door Alarm System, Wireless Diy Smart Home Security System, With Phone App ?ALPHA WIRELESS SECURITY SYSTEM - A smart way to protect your house with tolviviov Smart Home Security System. 8-piece kit includes the 1 alarm siren station, 5 windows door sensors and 2 remote controls. No contracts and No subscription fee. ?SMART ALARM SYSTEM for Home - tolviviov Alarm Security System is an affordable solution for your apartment security. You have full control over the door alarms for home security through your smartphone and get instant notifications of alarms alert in your house or apartment. ?CUSTOMIZATION - You can add extra door and window sensors, motion detectors, wireless doorbell, and water detectors to different rooms in your home security systems;It supports expansion of up to 20 sensors and 5 remote controls/keypads, which can be added to the WiFi alarm station. ?DIY INSTALLATION - Easily set up tolviviov Wireless Home Security System in minutes without tools. The wireless connection devices does not damage the wall. The alarm station should ALWAYS CONNECT to AC adapter. The backup battery works for 8 hours, only as an emergency battery. ?VOICE CONTROL and WIFI Network - Your tolviviov Home Alarm System can be easily controlled by Away, Disarm, and Home modes with your voice. Works with Alexa and Google Assistant. WIFI connection, Only works on 2.4GHz WiFi network, does NOT support 5GHz WiFi networks.