1、This Sound Monitor for CCTV Security System. 2、5-150 Square Meters Wide Range: Designed for the monitoring and recording applications within normal range, the widest monitoring range can be up to 150 square meters. 3、High sensitivity Sound Monitor: clear voice, low noise, high fidelity, applies to a variety of situations, such as for bank, examination room, shopping malls and so on. 4、Safe Use: Built-in reverse power protective circuit, low power expense, wide voltage range, safe and reliable to use. 5、Easy Installation: Compact design, small size, plug and play. Description: This is a new type of sound monitor with high sensitivity, designed for TV monitoring, anti-theft alarm and various security systems. Mini and compact design allows you to install it in small offices or larger areas to cover almost any indoor environment.   Features: This Sound Monitor for CCTV Security System. 5-150 Square Meters Wide Range: Designed for the monitoring and recording applications within normal range, the widest monitoring range can be up to 150 square meters. High sensitivity Sound Monitor: clear voice, low noise, high fidelity, applies to a variety of situations, such as for bank, examination room, shopping malls and so on. Safe Use: Built-in reverse power protective circuit, low power expense, wide voltage range, safe and reliable to use. Easy Installation: Compact design, small size, plug and play. Casing is made of plastic material, easy to clean in daily use. Specifications: Color: White Power Supply: DC 9V-12V Working Current: 25-40mA Frequency Range: 200Hz ~ 10kHz Frequency Response: 2.5 dB Monitoring Range: 5 ~ 150m2  Output Impedance: 600 Ω Output Voltage: 0 ~ 6V Size: Approx. 70 x 70 x 42mm / 2.7 x 2.7 x 1.7in Package Weight: 79g   Package List: 1 x Audio Pickup Microphone Note: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.