What's in the box:

ammoon HA400 Ultra-compact 4 Channels Mini Audio Stereo Headphone Amplifier with Power Adapter

This 4 channel stereo headphone amplifier is designed for all types of headphones, it allows 4 people listener simultaneously and setting volume independently, its high-power stereo amplifier ensures highest sonic quality even at max. volume, ultra low noise 4580 operational amplifiers provides you outstanding audio performance.

Features:
Super-compact 4-channel stereo headphone amplifier applied for studio and stage.
Features 4 headphone output channels and 1 input channel.
Each output channel with volume control for setting volume independently.
Highest sonic quality even at maximum volume levels.
Ultra low noise 4580 operational amplifier provides you outstanding audio performance.
12V DC power adapter included, with light for indicating power on.

Specifications:
Material: Metal
Color: Black
Power Adapter: US Plug
Voltage: 12V(Out); 110-240V(In)
Input Jack: 1/4'' TS Connector, Stereo
Output Jack: 1/4'' TRS Connector, Stereo
Item Size: Approx. 10.5 * 5.7 * 4.7cm / 4.1 * 2.3 * 1.8in
Item Weight: 188g / 6.6oz
Package Size: 22.5 * 14 * 9cm / 8.9 * 5.5 * 3.5in
Package Weight: 385g / 13.6oz

Package List:
1 * Amplifier
1 * Power Adapter
1 * User Manual (English)