This Sound Monitor for CCTV Security System.
100 Square Meters Wide Range: Designed for the monitoring and recording applications within normal range, the widest monitoring range can be up to 100 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.

What's in the box
1 X Pickup Microphone