• Its Just a Sensor. It can't work stand alone, and doesn't have any Alarm or Siren inbuilt, You need to have a GSM Based Wireless Security Alarm System to use this sensor.
• Easy to install--just peel and stick, Built-in omnidirectional antenna - The door/windows alarm with built-in antenna to strengthen the signal, make it more sensitive.
• Can't work standalone - The door detector work with home alarm system,use as alarm accessories.
• Low-voltage reminder function - When wireless door sensor is in low voltage, it will flash light all the time to remind user change the batteries.
• Magnetic sensor switch detects entry protecting your home or office. Superior circuit design, High-performance and low power consumption.