Ctwezoikmt 1.GAIN GAIN knobSets the volume of the microphone or line nput signal supplied to this channel. The GAlN knob is used to adjust the sensitivity of he microphone and lineinput signal. This allows the external signal to be tuned to the desired internal control level.2. High impedance [-Z] switch buttonTo connect the guitar directly to the ixer without using the Dl box, this switch first: Then connect the output of the guitar to the channel input.The optimized input impedance ensures direct connection and high frequency fidelity.3. MIC/LINE/XLRinput interfaceUsed to connect microphones, Musical Instruments or external audio equipment.The multi-function jack supports both XLR and PHONE plugs.Audio Interface Recording Sound CardMaterial: plasticcolour: blackPackage Contents:1 x Audio Interface Sound Card1 x USB Cable1 x English User ManualOnly 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.