Bluetooth 5.4 Car AUX Music Audio TransmitterReceiver 1. Dual-function receiver (RX) and transmitter (TX) signal, freely switchable, compatible with various devices. 2. Equipped with a high-performance Bluetooth 5.4 chip, enhancing signal transmission response for faster, more stable, and smoother connections, eliminating lag and stuttering. 3. Supports SBC high-definition decoding, high sampling rate, clear sound quality, eliminating noise and current, restoring sound details, and allowing you to fully enjoy your music. 4. Built-in 300mAh battery, Type-C fast charging, approximately 2 hours for a full charge, providing approximately 16 hours of music playback, supports charging while using for even more enjoyment. 5. Supports echo cancellation and noise suppression technology for deep noise reduction, built-in microphone for one-button answering, hands-free, high-definition calls. 6. Connect to the 3.5mm audio jack, activate receiver mode, and transform old speakersamplifiers into Bluetooth devices for an immersive music experience. 7. Built-in antenna enhances signal strength, achieving true 10-meter unobstructed long-distance transmission with a more stable signal. 8. After successful initial pairing, automatic connection upon power-on eliminates the need for repeated pairing, making it simple and convenient to use. 9. Power supply: Type-C interface 10. Product dimensions: 34x13.8x57.3mm