1、The barrier free transmission distance can up to about 20m / 65.6ft, and the signal is stable and low delay. 2、Support multi device expansion, bluetooth receiving mode, optical fiber coaxial digital to analog conversion. 3、Using bluetooth 5.0 chip, low power consumption, high speed, smoother music experience. 4、HiFi shocking sound quality, enjoy lossless music, and support U disk playback, drive free, plug and play. 5、It is made of high quality aluminum alloy, which is durable and can extend its service life appropriately. Item Type: Bluetooth Receiver & Audio Converter Model: B55 Material: Aluminum Alloy Bluetooth Version: V5.0 Frequency Range: 10Hz-20kHz Signal To Noise Ratio: >110dB Power Supply Interface: Type C Output Interface: 3.5mm Audio Impedance: 75Ω Transmission Distance: ≤ Approx. 20m /65.6ftInput Voltage: DC 5V Performance: HiFi Level 1 x Adapter 1 x Audio Line 1 x RCA Line 1 x Audio & Video Line 1 x Data Line 1 x Coaxial Line 1 x Manual