Features:  1. It automatically identifies the AUX and SPDIF connection.  2. Intelligent LED Indicator, The blue LED light can display the real-time status of codec transmission in RX / TX mode.  3. Switch the RX / TX mode freely.  4. Used the latest CSR8675 chipsets and Bluetooth 5.0 versions.  5. 2-In-1 Bluetooth transmitter (TX) / receiver (RX).  6. Enjoy high-resolution audio and Dolby sound quality.  7. The TX and RX mode supports simultaneous connection of two Bluetooth devices, so you can share the fun with your friends. The Bluetooth adapter automatically connects to your previously paired devices when turned on.  8. The long-lasting lithium-ion battery with 600 mA can play over 24 hours continuously while it is fully charged in just 3 hours. The maximum wireless distance is 20 meters (without obstacles).  9. Multiple applications – digital optical + 3.5 mm AUX + RCA cable.     Specifications:  1. Bluetooth version: V5.0, CSR8675-Chipsetz;  2. Protocol: RX: A2DP AVRCP TX: A2DP;  3. Transmission distance: >10m;  4. Battery: 600mA;  5. Working time: RX>18H, TX>22H;  6. Charging time: 3 hours;  7. Voltage: DC5V;  8. Inout/ output: SPDIF, 3.5mm stereo audio interface;     Package Included:  1 X Bluetooth 5.0 Adapter;  1 X User Manual;  1 X Fiber optic cable;  1 X USB charging cable;  1 X 3.5MM audio cable;  1 X RCA audio cable