2 XLR/6.35mm interfaces at the input end, balanced, Output: 1 3.5mm headphone jackInput impedance 20 kilohmsFrequency response 20Hz-80kHzTotal harmonic distortion + noise 0.01%Signal-to-noise ratio 90DBFront panel:The headphone output port can accept a 3.5mm headphone plug.Battery statues indicator light shows the current battery life (the indicator light becomes lighter when the voltage is too low)The VOLUME knob adjusts the headphone output sound volume.The Balance knob adjusts the balance between the left and right channels of the input terminal.The Mode button selects whether the audio connected to inputs INPUT(L) and INPUT(R) is mixed in stereo or mono. In Stereo mode, audio connected to INPUT(L) is sent to the left earphone, and audio connected to INPUT(R) is sent to the right earphone. In mono mode, the audio connected to INPUT (L) and (R) is sent to the headphones on both sides, and the volume between the two audio sources can be adjusted using the Blanc knob.Rear panel:Power button turns power on and offINPUT(L) receives the signal through the XLR/6.35mm cable. In stereo mode, the signal is sent to the left channelINPUT(R) receives the signal through the XLR/6.35mm cable. In stereo mode, the signal is sent to the right channel.Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on.Voltage:AC100-240VColour:BlackMaterial:MetalSize:About 125x86.5x35mmPackage Contents:1 x Headphone Amplifier1 AdapterOnly 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.