High-fidelity sound quality, full intensity, whether it is symphony or HIFI music can perform very well. 5.0 Bluetooth wireless transmission, support mobile phones, tablets, laptops and other devices, high-fidelity wireless transmission. USB lossless playback, support WMA//MP3/FLAC/APE and other lossless audio formats, U disk direct playback. Connect devices that support optical fiber and coaxial digital interfaces, such as smart , players, , set-top boxes... Connect the earphones to the HEADPHONE interface of the tube amplifier to enjoy HIFI music. Active subwoofer signal output, connect the subwoofer, the effect is more shocking. The front stage is by 4 electronic tubes, and each duct has a clear division of labor, which ensures that the HIFI sound performance can achieve a true and natural output effect. Dual VU meter display, classic and retro. adjustment of treble and bass, which can be adjusted at will, and the sound quality is freely controlled by you. Parameter: Rated power: 35W+35W Output function: 80W+80W Treble and bass adjustment: 10db Output impedance: 4-8 Frequency response: 20Hz-20KHz Vacuum tube: 6F1*2/6U1*2 Signal-to-noise ratio: 80db Cooling technology: energy-saving high-speed fan Sensitivity: 650mv Colour:A:gold Material:Metal Package Contents: 1 x Tube Amplifier 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.