Features:
Portable headphone amplifier with four stereo 1/4 inch and four 1/8 inch headphone outputs.
Stereo 1/4 inch and 1/8 inch jack and RCA stereo inputs(wired in parallel) can be connected to any line-level audio source.
Built-in high quality potentiometers for each channel volume control.
DC 5V power supply, can be powered by USB power adapter, power bank or computer USB port.
With Stereo/Mono switch for selecting stereo or mono signal to be sent to the output channels.
Compact size and full metal shell design, easy to carry around and durable to use.

Specifications:
Brand: ammoon
Model: AHA04
Material: Metal
Color: Black
Input Connector: stereo 1/8 inch TRS jack, Stereo 1/4 inch TRS jack, RCA stereo connector
Input Impedance: 22K ohm
Max. Input Level: +22dB
Output Connectors: stereo 1/8 inch TRS jack, Stereo 1/4 inch TRS jack
Output Impedance: min. 16 ohm
Max. Gain: 20dB/channel
S/N Ratio: >98dB
Frequency Response: 20Hz-20KHz
THD:< 0> Power Supply: DC 5V, >=1000mA via USB power adaptor
Item Size: 11.3 * 7.3 * 5.9cm/ 4.4 * 2.9 * 2.3in
Item Weight: 375g/ 13.2oz

Package List:
1 * Amplifier
1 * USB Cable
1 * User Manual (English)