【Home Multi-purpose Sensor Alarm System】 The home security systems will be triggered when door or window is opened or closed, you will get an instant alarm notification on your phone within about 1 - 8 seconds depends on Wifi networks. (NOTE: Only support 2.4Ghz. No built-in siren, but the alert message to your phone.) 【24H Monitoring】 The push notification feature on the house alarms security system app can be disabled when you're at home, and the wifi door sensor will continue to record a history for you to view when you need to. 【Easy to Install】 The Magnetic Sensor alarm system is very easy to install and you can attach it to door or window frames by either double-sided tape or screws. Double-sided stickers and screws are included in the box. Note: Make sure the sensor is aligned with the magnet and the gap is less than 10mm. 【What do you get?】 DIY Wifi home security systems: 1x120 DB speaker, 1x power cord, 1x infrared sensor, 2x remote control, 4x door sensor, 1x instruction manual, and our lifelong friendly service. Our DIY home burglar security alarm system features speakers that connect to up to 40 wireless detectors, 10 remote controls, 10 door magnetic sensors and a maximum sound of 120 decibels to deter thieves or thieves.