T40 2 In 1 Bluetooth 5.1 Receiver NFC Transmitter Car AUX Adapter 1. Back clip design, firm and not falling, easy to clip clothes 2. Mini design, easy to wear 3. Convert the wired device into a bluetooth signal, and wirelessly transmit it to the bluetooth device for output 4. Independent DAC decoding chip, high dynamic range signal-to-noise ratio SNR is greater than 120 decibels, sound details are restored and transparent, and you can enjoy HIFI sound quality 5. Bluetooth 5.1 refuses to freeze exercise, stable and fast connection 6. Smart NFC, one-touch pairing, just get close to the mobile device for quick bluetooth pairing 7. Receivetransmit, MIC call, 2.5mm+3.5mm headphone output, camera function, TF card, lossless sound quality 8. Supports connecting two mobile phones at the same time, and the two mobile phone cases can be used arbitrarily 9. TF card playback, no need to carry a mobile phone, support MP3 WMA WAV APE FLAC and other formats for playback, you can enjoy music without Bluetooth connection to your mobile phone 10. Built-in high-sensitivity independent microphone, supports high-definition voice calls on mobile phonescomputers, video conferencing or game blackout, can handle it easily 11. The low battery can be used while charging, which is convenient and worry-free 12. One-key photo function: in RX mode, turn on the camera, and short press the photo button to take a photo 13. Material: ABS+PC 14. Listening time: 10 hours 15. Charging time: 2 hours 16. Battery capacity: 200mah 17. Power mode: USB charging built-in lithium battery 18. Charging voltage: DC 5V 19. Transmission rate: 3Mbps 20. Operating frequency: 2.4MHz 21. Operating range: less than or equal to 10 meters 22. Bluetooth protocol: AVRCP A3DP HFP HSP 23. Product list: Bluetooth receiver, packing box, 3.5mm audio head, manual, power supply cable 24. Weight: about 24.4g