FocusProAudio Compact 4-Ch Stereo Headphone Amplifier with DC 12V Power AdapterLooking for a compact and portable headphone amplifier that can provide high quality sound without any noise feedback? The FocusProAudio Compact 4 Channel Stereo Headphone Amplifier is the perfect solution for you. It allows up to four people to listen to the same audio source with independent volume controls. Benefits and Features This headphone amplifier features four independent channels with separate volume controls, stereo input and output, non