2-In-1 Bluetooth 5.4 Transmitter & Receiver AUX CarTravel Adapter with 3.5mm Jack, TF Card Slot, Lapel Clip Design 1. This 2-in-1 Bluetooth 5.4 Transmitter & Receiver is a versatile audio adapter designed for car, home, and travel use. It supports AUX 3.5mm devices, TF card playback, and dual-mode operation (transmitreceive) for seamless wireless audio streaming. 2. Dual Mode Functionality: --TX Mode: Transmits Bluetooth audio to wired speakers or amplifiers. --RX Mode: Receives Bluetooth signals from devices (e.g., smartphones) for wired audio output. --TF Card Mode: Directly plays music files (MP3WMAAPEWAVFLAC) from a microSD card. 3. High-Resolution Audio: Delivers clear sound with high-fidelity decoding. 4. Built-In HD Display: Shows real-time status (battery, mode, connection). 5. Lapel Clip Design: Portable and lightweight for easy attachment to clothing. 6. 400mAh Rechargeable Battery: Up to 20h in RX mode 15h in TX mode. 7. Noise-Reduction Microphone: Supports hands-free calls with enhanced voice clarity. 8. Wide Compatibility: Works with TVs, cars, headphones, speakers, and amplifiers via 3.5mm AUX. Parameters: 1. Function: receivingtransmittingTF card playback (TF card not included) 2. Material: ABS 3. Size: 63 x 31 x 23mm 4. Battery capacity: 400 mAh 5. Charging interface: Type-C 6. Charging time: about 2 hours 7. Input power: DC 5V 1A 8. Bluetooth version: V5.4 9. Transmission distance: 10m