[Receiver and Transmitter] Consists of a transmitter and a receiver, and the integrated amplifier can produce infrared beam. [Anti-interference] Narrow infrared beam (I or II) can avoid interruption by external light [Detection distance] Even installed at low height(20-40cm from the floor), the detecting distance can also be guaranteed(5-15meters). [Application] Compatible with sliding gate openers,garage door openers and other access control systems. Technology: Infrared Receiver Range:Less than 20m (Range can be reduced to 30% in bad weatherconditions: for, rain, dust, etc) POWER SUPPLY:12 -24V DC/AC OPERATING TEMPERATURE:-10℃ to 70℃ Note:Due to different production batches, there are differences in appearance, which does not affect usage. Colour:Black Material:Plastic Package Contents: 2 x Receiver 2 x Transmitter