[MA400 Headphone Amplifier headphone amplifier has the effect of using condenser microphones with ultra-low noise direct insertion. It can provide reliable phantom power for condenser microphones. The GND LIFT button can be used to maintain the ground connection with the mixer to prevent static charges from interfering with your audio signal. [ Volume Control]The headphone amp supports adjustment of the volume of the microphone signal and the volume of the mixer or Hi-Fi unit signal, and has a mono/stereo switch for switching to achieve maximum flexibility. [Headphone Output]With 1/4inch and 1/8inch output jacks, it can be dapted to most headsets and convenient to use. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage: AC100-240V Colour: black Material: plastic Package Contents: 2 x MA400 Headphone Amplifier 2 Adapter 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.