Door sensor is a safety alarm device, which is used to detect whether doors, windows, drawers, have been opened or moved illegally.

PIR motion detector (passive infrared sensor) is designed to detect human movement indoors.

Wireless Smart Doorbell Kit for Houses, Smart Home, Home Automation Use

Wireless Smart Doorbell with Several Melodys Can be Selected

This 4-Keys Learning Code Remote Control has MCU Inside, which is widely used in access control, remote sensing & telemetry, security alarm devices, home automation, industrial control, lighting control, etc.

This SOS Remote Control can be used as a wireless doorbell transmitter, which is widely used in access control, security alarm devices, home automation, motor switching control, lighting control, etc

This SOS remote control can be used as a wireless doorbell transmitter, which is widely used in access control, security alarm devices, home automation, motor switching control, lighting control, etc.

This remote control is widely used in access control, security alarm devices, home automation, industrial control, motor switching control, car key, etc

433/315 MHz 2/4/6/8 Keys Learning Code Remote Control, for access control & industrial control use