Features:Unique design of the Circuit of Digital Filter with High Capacity anti RFI / EMI.Small and beautiful appearance for the Infrared detector. Optical antiinterferencia Housing Professional.Functions of frequency adjustment of four channels, suitable for the installation of pile in the same place.Widely used for Alarm System, Access Control System, etc.IP55 Sealed Design for anti Rain (FOG), Dust (Worms) and other Integrated climatic conditions, can maintain normal operation in a tough environment.Specifications:Color: BlackMaterial: ABSQuantity: 1 pcsOperating Voltage: 9 ~16 V DC / ACWarning: 20 m distanceINPUT CURRENT: 20mA 18ma - T - R;Frequency: 38 kHz Relay output: N.C. / N.O.Wavelength: 940nmHumidity: 95% - 5% RHOperating Temperature: - 25% + 55%Size: 69.5*26.4*22.5mm/2.7*1.0*0.9 inPackage Weight: 69g/2.4ozNotes: 1. There may be an error of 0 - 1 cm due to manual Measurement. Make sure that you don't Care before you BID.2. Due to the difference between different Monitors, the picture may not reflect the actual color of the article. Thank you!Package List:1 * Transmitter1 * Receiver1 * User Manual8 * Screw.