Item Type: Pickup Material: ABS Use Place and Area: Bank School Public Security Agency (5-100) Signal Transmission Distance: Approx. 1000m/3280.8ft Frequency Response: 20Hz - 20kHz Pointing Characteristic: Omnidirectional Output Signal Amplitude: 2.5Vpp/-25db Connection Method: 3-wire system (red: positive power supply, black: common ground GND, white: audio positive) Transmission Cable: RVVP3 x 1.5mm Power Supply Voltage: DC9-18V Diameter: Approx. 78mm/ 3.1in Height: Approx. 28mm/ 1.1in Package List 1 x Pickup 1 x English Manual Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1Surveillance pickup has strong antiinterference, and has the advantages of pure sound quality and powerful action. 2Surveillance pickup has exquisite round appearance, precise craftsmanship and materials help restore highfidelity sound quality and make the sound even. 3The audio sound monitor kit microphone is high sensitivity and high fidelity performance. 4Omnidirectional pickup, high sensitivity. Closed circuit surveillance pickups, safe to use. 5High quality wire, low power consumption, long transmission distance, durable, stable and safe.(pickup area,5~ 100)