HA800S Headphone Amplifier 8 Channels Mono/Stereo Metal Stereo Headphone Amps Audio Amp. Ultra-compact 8-Channel Mini Audio Stereo Microphone AMP. with Power Adapter This 8-channel stereo headphone amplifier is designed for use with all types of headphones and therefore provides maximum flexibility. Its high-power stereo amplifiers guarantee the highest sonic quality even at maximum volume. The ultra low-noise 4580 operational amplifiers ensure outstanding audio performance. Features: Ultra compact stereo headphone amplifier for studio and stage applications. Equipped with 8 headphone output channels and 1 input channel. The volume of each output channel can be independently controlled. The volume of each output channel can be switched between single and dual channels. Even at maximum volume, it can provide the highest sound quality for each earphone. Ultra low noise 4580 operational amplifier with outstanding performance. Equipped with a DC 12V power adapter. Specifications: Plug: EU / US (Optional) Input: 100-240VAC, 50/60Hz Output: 12V, 2.5A Line Input:   Type: 1/8" TS connector, stereo   Impedance: 100kΩ   Max. Input Level: +15dBu Headphone Output:   Type: 1/8" TS connector, stereo   Impedance: Approx. 80Ω   Max. Output Level: Approx. 40mW in 100Ω Material: Metal Item Size: 198 * 72 * 26mm / 7.80 * 2.83 * 1.02in Item Weight: 427g / 15.06oz Package Weight: 640g / 22.57oz Package Size: 24 * 17.5 * 6cm / 9.45 * 6.10 * 2.36in Package List: 1 * Amplifier 1 * Power Adapter 1 * Manual (English)