The Microamp HA400 is a 4-channel stereo headphone amplifier designed to accommodate all types of headphones. It features four high-power stereo amplifiers, ensuring excellent sound quality even at maximum volume levels. Each channel has its own output level control, allowing users to customize the listening experience for individual preferences. The headphone amplifier comes with a DC 12-Volt adapter included for a convenient power supply. With its versatility, high-quality performance, and individual control options, the Microamp HA400 is an ideal choice for anyone needing to amplify and enhance their headphone audio experience.