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High-sensitivity microphone amplification, ALC automatic level control, magnification 1000 times, you can listen to faint sounds. Directly drive the earphone to listen, the e output port can be connected to other recording devices, the interface is 3.5mm. Colour:black Material:Metal + PCB Size:6.3 x 5.2 x 2.2cm Package Contents: 1 * Microphone Amplifier 1 * USB Cable 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.