1、Dual Input: Bluetooth tube amplifier receiver is a dual input, hands free, relay automatic switching (bluetooth first). 2、Clear Sound Quality: Stereo tube amplifier receiver uses bluetooth receiver and independent DAC decoding 9018 dual chip architecture I2S signal decoding to bring clearer sound quality. 3、Bluetooth 5.0: Stereo tube amplifier receiver uses bluetooth 5.0 higher bandwidth 2Mbps data volume, 44.1kHz/16bit dual channel sound signal code rate up to 1.411Mbit/s. 4、Sound Quality: Electronic tube bluetooth receiver eliminates burr or sharpness in the sound, with bright high frequencies, clean midrange, and elastic low frequencies. 5、Adjustment Knob: Bluetooth tube amplifier stereo receiver comes with independent adjustment knobs for high and low frequencies, and the high and low frequencies are freely adjustable. Item Type: Electronic Tube Bluetooth Receiver Material: Aluminum Alloy Electronic Tube: 6K4 Input Port: Bluetooth 5.0 and RCA Double Lotus Output Port: RCA Double Lotus and 3.5mm Headphone Hole Op Amp Chip: Dual 5532 (Op Amp Block, Can be Unplugged and Replaced) Distortion: ≤ 0.1% Signal To Noise Ratio: ≥ 98db Frequency Response Range: 20Hz-20kHz (±3db) Tweeter Adjustment Range: ±6db Bass Adjustment Range: ±10db 1 x Sound Adapter 1 x Instruction Manual 2 x Electronic Tube 1 x Receiver Bar 1 x Power Cord