An add-on module suitable for use in conjunction with CCTV cameras or anywhere you need remote audio monitoring. This little board features a quality electret microphone and amplification. Connection is via 4 wires * Red: +12Vdc * Black: Gnd * White: Audio out * Black: Gnd * Specifications: * Power supply: 12Vdc±2V * Current: 30mA * Output power: 360mW * Impedance: 600Ω * Dimensions: 21 x 21mm * Weight: 3g