Zero gain design, level control: After processing the input signal (such as 1V), the maximum output remains at 1V without additional amplification, strictly restoring the original signal level and avoiding the risk of distortion caused by gain ·Compatible with multiple devices, flexible scene adaptation: can seamlessly match with power amplifiers, passive speakers, and also adapt to various monitoring-grade equipment to meet different HIFI system setup needs Lossless Sound Quality, No Coloration of Original Sound: No Coloration Interference Throughout, Achieving Pure Signal Transmission, Retaining Music Details and Original Sound Texture, Ideal for HIFI Enthusiast Systems Volume Control Through electronic components, the input audio signal can be adjusted for attenuation, achieving low distortion and smooth volume control, avoiding potential noise introduced by active preamps High precision, low noise, wear-resistant, long lifespan Color: Black Material: Plastic+Metal Package Contents: 1*Amplifier 1*Remote control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.