Any sensor that detects a danger signal trigger a 130 decibel alarm from the host, and a notification also be issued on the mobile app, providing 24-hour comprehensive protection for your home Alarm Host Appearance Display,Power on, LED light on; the button, the corresponding indicator light up; Any key 8 seconds, reset the device; The 130DB high-pitched alarm is triggered, and the traffic light flashes alternately Full Mobile APP Monitoring,, out, you can check at any time, everything in hand, safe and Regular Deployment and Withdrawal of Defenses,Stable and reliable high-end alarm, long , disarming, , SOS emergency, different functions to meet your different needs Voice Control,Free your hands by arming your system with voice commands at all times Specification: 1. Full Set: Includes one host and five sensors, it supports ev1527 sensors. 2. Alarm Host: Other sensors are connected to this host through a 433MHz communication protocol, and the host emits a 130 decibel sound based on the sensor's signal. At the same time, the host connects to through WiFi and synchronously pushes the alarm signal to the mobile app. 3. Door Bell: can be installed at the door for use 4. Door Sensor: can be installed in doors, , drawers, and other places 5. Human Sensor:Detecting the presence of the human body through infrared sensing 6. Remote Control:There are 4 functions on the remote control, which can turn on or off the alarm function of the sensor with one click, as well as the SOS emergency help function 7. SOS Button:An SOS emergency help button The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:plastic Package Contents: 1set * alarm device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.