1. Material: PC, ABS 2. Bluetooth operating frequency: 2.4GHz 3. Transmission rate: 80Mbps 4. Bluetooth transmission distance: about 10 meters 5. Bluetooth version: V5.0 6. Working frequency: 2400MHz 7. Interface: AUX+USB 8. Basic functions: Bluetooth receiverBluetooth transmitterTF card playbackactive search reject blind connectionhands-free callnavigationwireless music listeningcomputer card readerexternal sound cardmemory back connection 9. Scope of application: various types of cars, mobile phones, computers, stereos, power amplifiers and other devices with audio inputoutput interfaces 10. Power supply mode: USB direct plug chargingpower supply 11. Battery capacity: 170mAh 12. Music format: MP3APEFLACWAVWMA 13. Support protocol: HFPA2DAVCTP 14. Input parameters: DC 5V2.1A 15. Packing list: adapter x1, 3.5mm audio cable x1, manual x1 16. Size: about 7.5x2.5x1.2 cm 17. Weight: about 15.4 grams Features: 1. Using PC+ABS material, high-gloss craftsmanship, comfortable hand feeling 2. Equipped with Bluetooth 5.0 chip, stable transmission without delay, and lossless sound quality 3. Bluetooth receiving and transmitting two-in-one, no driver, plug and play 4. LCD high-definition digital display, Bluetooth mode and working status are clearly visible 5. The launch mode can display the pairing name and actively search 6. Built-in 170mA polymer battery, continuous listening to songs for about 4H, USB direct plug chargingpower supply 7. Support TF card playback, built-in smart decoder can be played directly (support FAT32 format), but also a card reader and computer external sound card 8. Built-in high-definition microphone, support hands-free calllisten to musicnavigation 9. Memory function, automatically connect back after the first pairing 10. The barrier-free signal is about 10 meters stable transmission, 2.4G high frequency signal