Made by Material components, durable, firm and stable for us to use. Transistor style HIFI microphone pre-amplifier. Sound volume adjustable suitable for all camera module. Microphone Module only, other accessories demo in the picture is not included! Item Type: Microphone Module Working Voltage: DC9-12V Frequency Range: 200-10KHZ Monitor Range: 100m² Transmission Distance: 1000m Material: PCB Length: 130mm/5.1inch Note:Transition: 1cm=10mm=0.39inch Due to different product batches, the appearance may vary, which does not affect the use Colour:As Shown Material:PC+Plastic Package Contents: 2 x Microphone Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.