Item Type: Condenser Mic MixerMaterial: Aluminum AlloyVoltage: DC 5VSound Input Interface: 1 x 3.5mm/0.1inSound Output Interface: 4 x 3.5mm/0.1inPackage List1 x Condenser Mic Mixer1 x Power Cable1 x Sound CableIf there is noise when using this USB to DC power cable, please use this 5V power adapter.1[Adjustable Volume] The mixer supports four condenser mics working simultaneously, with independently adjustable volume, and the total output of the mix is connected to the mic input of the sound card or computer. 2[Compatible Devices] Condenser microphone mixer can amplify 4 times, the perfect way to listen to music and mix multiple sound sources, including smartphones, tablets, computers, MP3 players, etc. 3[Multi Source Mixing] Small microphone mixer extender that is easy to carry and operate, allowing unlimited mixing of multiple sources. Beautiful and dynamic sound with new rail to rail op amps. 4[3.5mm Sound Interface] 3.5mm interface of this mic mixer extender board comes with bias voltage, which is plug and play and can be connected to common electret microphones, condenser microphones, etc. 5[4 In 1 Out] Stereo 1 out 4 in. Microphone mixer can be connected to 4 sound inputs at the same time, each track has an independent volume adjustment knob, can be output through headphones and speakers.