2 in1 Universal Car AUX Bluetooth Receiver and Transmitter 1. Bluetooth solution: V5.4 2. Supported protocols: A2DP, AVRCP, HFP, HSP 3. Frequency: 2.4GHz-2.48GHz 4. Bluetooth range: within 10 meters 5. Battery capacity: 300mAh 6. Working time: Approx. 11 hours (transmit mode), Approx. 15 hours (receive mode) 7. Charging time: 2 hours 8. Bluetooth receiving function: supports connection to 1 mobile phone or 1 computer(Supports connection to 1 transmitting device only) 9. Bluetooth transmitting function: supports simultaneous connection to 2 headsets or 2 speakers (Supports simultaneous connection to 2 receiving devices) 10. Supports echo cancellation and noise suppression technology, deep noise reduction, built-in microphone, one-button answering, hands-free amplification, and high-definition calls 11. Made of ABS material, soft and flexible, easy to use even in narrow spaces such as car armrests or wall-mounted TVs 12. After successful initial pairing, it automatically connects upon power-on, requiring no further pairing, making it simple and convenient to use. 13. Equipped with a high-performance Bluetooth 5.4 chip, enhancing signal transmission, providing rapid response, and a more stable and smooth connection, eliminating lag and stuttering. 14. Built-in battery with Type-C fast charging, fully charging in approximately 2 hours, providing about 13.5 hours of music playback. Supports charging while using, unlocking more enjoyment. 15. Supports SBC high-definition decoding, high sampling rate, clear sound quality eliminating noise and current, restoring sound details, allowing you to fully enjoy beautiful music. 16. Built-in antenna enhances signal, truly achieving unobstructed long-distance transmission up to 10 meters, with a more stable signal. 17. Dimensions: 28.5 x 13.4 x 130 mm 18. Net weight of the main unit: 17g