PRINCIPLE:This infrared detector emits a switching signal through the built-in relay operation. When the emitted infrared beam is blocked, the relay will send a switching signal, and the signal can be set to normally open or normally closed. SMALL VOLUME:The infrared sensor with small volume, maximum detection distance up to 20 meters. EXTENSIVE APPLICATIONS:The simple beam alarm photoelectric has extensive applications, available for road gates, automatic door, mechanical operation safety protection, access control, security system and more INSTALLATION:When installation the garage door sensor, first install the receiver, and then install the transmitter. When they are in the same horizontal line, the OFF light in the receiver is OFF state, and then fix, the installation is completed after connecting the wires! INSTALLATION HEIGHT:Installation height of infrared photocell beam sensor should be more than 20cm. Installation distance between the transmitter and the receiver should be no less than 2m. The infrared protection device should be placed vertically and on the same horizontal line., Manufacturer: KUIDAMOS