Sell Multifunction Door Window Magnetic Sensor Burglar Alarm Security System with Remote Control best price

Magnetic sensor switch detects entry protecting your home or office whether you are in or out. Press the DEFENSE key for the alarm mode. When the door is opened, the host will issue a 125dB alarm sound, which will automatically stop after 30s. Press the DOORBELL key for the doorbell mode. When the door is opened, the main unit will send a normal doorbell instead of an alarm sound. Pressing the SOS key is a help-seeking mode. In an emergency, you can use the remote control to make the main unit sound an alarm to draw attention and ask for help.