Echo Mic Preamp 2-Channel Audio Mixer 3.5mm/6.5mm Dual Microphone Echo Amplifier Computer Micphone Preamplifier Made of Aluminum Alloy and Treated With Surface Oxidation - Plug and Play The mini integrated amplifier is made of Aluminum alloy metal material, and the aluminum alloy housing is surface-polished, hard and durable. Volume Adjusting Knob is well-designed and user-friendly. Added with Reverberation Switch, Reverberation Time and Reverberation Depth, specially designed for high-end speaker control system to meet all high-impedance microphone drive demands. The servo voltage stabilizing circuit and two-channel female stereo inputs are well-designed. The interface panel reserves double-microphone input interface in 6.5mm/3.5mm. Well-tailored for Karaoke/Studio recording/Computer microphone. The special frame structure and gold-immersed double-sided circuit board can effectively screen noise and hum to ensure clear and soft sound. This device equips imported professional reverb and echo control chip, which is a perfect noise reduction machine with driver-free design. Besides, it permits plug in and plug out without any need of connector.