180 Degrees Passive Infrared Motion Sensor (490-0208) Features Faxback Doc. # 17223 The Radio Shack 180 degrees Passive Infrared Motion Sensor is designed for use with security alarm systems, such as those sold by Radio Shack. Passive Means that the sensor's lens responds to heat within its coverage area. When an intruder enters a protected area, the sensor detects the temperature change and triggers the system's alarm. You can use the motion sensor to help protect any area of your home while you are at home or away. Its features include: Four Interchangeable Lenses, Wide - let you select the lens which Angle, Long Distance, Pet best suits your needs. and Curtain) Ultra High Level RFI/EMI Protection - prevents interference from radio frequencies between 136 and 1000 MHz. Temperature Compensation Circuit - helps reduce false alarms. Tamper Protection Circuit - triggers the alarm system when someone tampers with the sensor. Programmable Pulse Count - lets you set the number of zones the intruder must cross and how long the zones must be violated before the sensor triggers the alarm. Adjustable Angle Scale - lets you adjust the sensor in a variety of angles for more effective coverage. Dual Element Low-Noise Pyroelectric - extends the sensor's coverage Detector area and reduces false alarms. Compact Design - makes the sensor easy to install in almost any indoor location. Programmable Walk Test Indicator - makes testing the sensor's coverage range easy!