Type: Vacuum Tube Bluetooth Receiver Material: Aluminum Alloy Voltage: 100-240V Vacuum Tube: 6K4 Input Ports: Bluetooth 5.0 and Dual RCA Output Ports: Dual RCA and 3.5mm Headphone Jack Op-Amp Chip: Dual 5532 (Op-Amp Block, Detachable and Replaceable) Distortion: ≤ 0.1% Signal-to-Noise Ratio: ≥ 98db Frequency Response: 20Hz-20kHz (±3db) Treble Adjustment Range: ±6db Bass Adjustment Range: ±10db 1. Dual Input: This Bluetooth tube amplifier receiver features dual input, hands-free, relay automatic switching (Bluetooth priority). 2. Clear Sound Quality: Uses a Bluetooth receiver and independent DAC decoding 9018 dual-chip architecture I2S signal decoding for clearer sound. 3. Bluetooth 5.0: Employs Bluetooth 5.0 for higher bandwidth (2Mbps data volume), 44.1kHz/16bit dual-channel audio signal code rate up to 1.411Mbit/s. 4. Superior Audio: Eliminates harshness or sharpness, offering bright high frequencies, clean midrange, and elastic low frequencies. 5. Adjustment Knobs: Features independent treble and bass adjustment knobs for customized sound. Includes: 1 x Audio Adapter 1 x User Manual 2 x Vacuum Tubes 1 x Receiver Rod 1 x Power Cable