Function: When the microphone detects speech, it lowers the volume of background music. It automatically returns to normal when the speaking stops. Microphone Input Interfaces 6.35mm: Suitable compatible with dynamic microphones, conference gooseneck condenser microphones, etc. Microphone Input Interfaces 3.5mm: Supports three-pole plugs, with built-in bias suitable compatible with 5V condenser microphones, electret capsules, etc. Due to the wide variety of condenser microphones and different plug combinations, please be careful to distinguish. Audio Input: RCA interface Output: RCA interface Power Consumption: 0.25W Power Supply: DC12V-24V; please use a , low-ripple power adapter compatible with power supply. Microphone Amplification Gain: 36dB Microphone Input Impedance: 2KΩ Audio Input Gain: 0dB Audio Input Impedance: 50KΩ Output Impedance: 600Ω Explanation of the Three Adjustable Resistors' Functions ④ Sensitivity: The minimum microphone volume required to trigger the ducking effect. ⑤ Recovery Time: The time it takes compatible with the background music to return to its normal playback volume after the microphone stops receiving input. ⑥ Depth: The degree to which the background music volume is reduced when the ducking effect activates (i.e., when the microphone is in use). This can range from complete muting of the background music to retaining a moderate level of it. Color: Black Material: Aluminum Alloy Package Contents: 2 x Mic Preamp Audio Ducking 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.