2-in-1: Hifi Music Tube Bluetooth 5.0 Home Audio Receiver 2 Channel Amplifier and Headphone Amp. T20X can drive most home passive/desktop speakers and 3.5MM headphones. Achieve Hifi music quality. Bluetooth 5.0: Enjoy superior wireless audio experiences with Bluetooth 5.0 core. Faster transmission and more stable connection extended long range up to 50ft/15m. Wirelessly stream audio anywhere you want. Vacuum Tubes: T20X is equipped with JAN 5654W Vacuum Tubes to get more warm sound. Applicable vacuum tubes model: 6K4/6J1/6A2/6J4/GE5654/6AK5/66*In vacuum tubes, etc. You can replace the vacuum tubes to DIY your stereo system. Different tube with different sound. Product Parameters: MAX Power Output: 100W x2@4Ω, Terminating Impedance: 4-8Ω, THD: ≤0.05%, SNR: ≥ 105dB, Amplifier Chip: TPA3221, Frequency Range: 20Hz-20kHz(±1dB). What you Get: T20X amplifier x1, Bluetooth antenna x1, 5654W Vacuum tubes x2, User Manual x1, 24V/4.5A Power Adapter x1, AC Cord x1, 24-month worry-free warranty, and friendly customer service.