Audio T20X Bluetooth 5.0 Vacuum Tube Amplifier Headphone Amplifier Stereo Audio Receiver 2 Channel Digital Mini Hi-Fi Passive Speaker Integrated Power Amplifier. 2 in 1 Vacuum Tube Bluetooth 5.0 Home Audio Receiver Amplifier and Headphone Amplifier. T20X can drive most home passive/desktop speakers and 3.5MM headphones. Achieve high-fidelity music quality. Enjoy an excellent wireless audio experience with Bluetooth 5.0 core. Faster transmission and more stable connection extend the long distance up to 50 feet/15 meters. Wirelessly transmit audio anytime, anywhere. T20X is equipped with 5654W vacuum tube for warmer sound. Applicable vacuum tube models: 6K4/6J1/6A2/6J4/GE5654/6AK5/66* in vacuum tubes, etc. You can replace the vacuum tubes to DIY your stereo system. Different tubes make different sounds. Model: T20X Output power: 100W x2@4Ω Terminal impedance: 2Ω - 8Ω Input mode: Bluetooth/RCA Output mode: Passive speaker/headphone Frequency range: 20Hz - 20kHz (±1 dB) Total harmonic distortion: less than equal 0.3% Signal-to-noise ratio: greater than equal 86dB Chipset: TPA3221 Operating voltage: 12V - 30V Bluetooth transmission distance: up to 28 feet (10 meters) Bluetooth name: for Fosi Audio T20X Device weight: 479.8g±10g Power supply: 24V 4.5A Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Plug Type:AU Plug,it applies to Australia and so on. Voltage:AC230V-240V Colour:Black Material:Metal Package Contents: 1 * Power Amplifier 1 * Power Adapter 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.