1、Surveillance pickup has strong anti‑interference, and has the advantages of pure sound quality and powerful action. 2、Surveillance pickup has exquisite round appearance, precise craftsmanship and materials help restore high‑fidelity sound quality and make the sound even. 3、The audio sound monitor kit microphone is high sensitivity and high fidelityperformance. 4、High quality wire, low power consumption, long transmission distance, durable, stable and safe.(pickup area,5㎡‑50㎡) 5、Suitable for tax bureau, service hall, school and other service windows. 1 x Pickup1 x English Manual Item Type: PickupMaterial: Aluminum alloyUse Place and Area: Tax bureau, service hall and other office windows (5-50㎡)Signal Transmission Distance: Approx. 1000m/ 3280.8ft Frequency Response: 15Hz - 20kHzPointing Characteristic: Interface pointingOutput 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 1.5mm²Power Supply Voltage: DC9-18V