CPVAN WiFi Door Alarm System(2nd Gen), DIY Wireless Home Security Kit for Kids Elders Safety, 1 Remote Control, 2 Door Window Sensors, 1 Base Station, Fit House, Garage, Apartment. Works with Alexa.

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A great fit for home security: The receiver working together with the window door sensors, making it a burglar alarm system and your 24h private guard. Put whole-home security at your fingertips with APP whether you are at home or at work. Wireless range with 500ft, and no monthly fees!
Powerful DIY: SmartLife App has built-in defense zone functions and product attributes and has Armed, Disarmed, and Home modes, you can give accessories more personalized settings according to your needs. This door alarm has 10 alarm tones built-in, and you can customize different music for each door sensor(door chime or door alarm).
Protecting all aspects: When the door or windows been opened, the receiver will sound an alert and you can receive mobile notifications so that you can know someone break-in or your kids, elders, your pets slipped out of the house at any time anywhere.
Expandability: Add additional components and accessories at any time. Up to 100 wireless detectors or doorbell buttons can be added. In the future, we will provide more accessories for you to choose from, such as window&door sensors, PIR motion detectors, doorbell buttons, etc.
Easy installation(2.4GHz Network): All accessories in the set are already paired before leaving the factory. This door alarm built in a Bluetooth module. As long as your router supports a 2.4GHz network, you can easily connect to the network by turning on the Bluetooth of your phone and following the instructions.