Feature:1. [4 Channels] 4 independent stereo high power amplifier sections of the headphone amplifier, even at maximum volume, for the highest quality for almost all types of headphones.2. [Share Single Stereo Source] 4 channels of amplifier, individual volume knobs for each output, no crackling, minimal distortion at top volume. No signal loss when connecting all four headphones.3. [Low Noise] Great for listening to music or watching TV if you have two or more settings on your computer or listening with a stereo amplifier, easy to use and ultra low noise.4. [Portable] The headphone amplifier features a durable and compact design ideal for applications requiring multiple headphone connections. Strong metal construction with tight connections and glossy knob operation.5. [Applications] The headphone amplifier is ideal for up to four people monitoring the mix for tracking during workouts, live use and listening to TV with earbuds. For studio and stage use.Specification:Item Type: Headphone AmplifierModel: HA400Material: MetalColor: SilverChannels: 4 ChannelsApplication: For Ultra Compact Headphone Amplifier Systems for Studio and Stage Use.Package List:1 x Headphone Amplifier1 x Power Adapter1 x Manual