The 6.5mm interface is suitable for dynamic microphone amplification, with a gain of 36.3db;<br> Power supply: DC 5V-12V, built-in boost power module ensures the dynamic range of sound, working current: 5v-43ma, 12v-17ma;<br> There are 2 output interfaces, 1.10K high-impedance interface, 2.600 ohm low-impedance interface, and three output terminal lines. Use 3 lines for dual-channel connection, and use 2 of them for mono-channel connection.<br> Colour:green<br> Material:plastic+metal<br> Package Contents:<br> 1 x Circuit Module<br> Only the above package content, other products are not included.<br> 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.