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: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. UK plug,it applies to Malaysia, the United Kingdom and so on. EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. AU Plug,it applies to Australia and so on. Voltage:AC110V/AC230V/AC100-240V/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 lit