Item Type: Bluetooth Receiver & Audio Converter_x000D_ Model: B55_x000D_ Material: Aluminum Alloy_x000D_ Bluetooth Version: V5.0_x000D_ Frequency Range: 10Hz-20kHz_x000D_ Signal To Noise Ratio: >110dB_x000D_ Power Supply Interface: Type C_x000D_ Output Interface: 3.5mm Audio_x000D_ Impedance: 75_x000D_ Transmission Distance: Approx. 20m /65.6ft_x000D_ Input Voltage: DC 5V_x000D_ Performance: HiFi Level1The barrier free transmission distance can up to about 20m / 65.6ft, and the signal is stable and low delay. 2Support multi device expansion, bluetooth receiving mode, optical fiber coaxial digital to analog conversion. 3Using bluetooth 5.0 chip, low power consumption, high speed, smoother music experience. 4HiFi shocking sound quality, enjoy lossless music, and support U disk playback, drive free, plug and play. 5It is made of high quality aluminum alloy, which is durable and can extend its service life appropriately. 1 x Adapter 1 x Audio Line 1 x RCA Line 1 xAudio& VideoLine 1 x Data Line 1 x Coaxial Line 1 x Manual