Item Type: Pickup Material: Aluminum alloy Use Place and Area: Tax bureau, service hall and other office windows (5-50) Signal Transmission Distance: Approx. 1000m/3280.8ft Frequency Response: 15Hz - 20kHz Pointing Characteristic: Interface pointing Output Signal Amplitude: 2.5Vpp/90dB sound pressure (A weighted) 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 Package List 1 x Pickup 1 x English Manual 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 fidelityperformance. 4High quality wire, low power consumption, long transmission distance, durable, stable and safe.(pickup area,550) 5Suitable for tax bureau, service hall, school and other service windows.