Bluetooth 5.3 Receiver NFC Function Stereo Amplifier To Wireless Adapter 1. Power supply voltage: DC 5V (no built-in battery) 2. Bluetooth version: Bluetooth 5.3 EDR, A2DP, HSP, AVRCP 3. Frequency: 2.4GHz-2.48GHz 4. Transmission distance: open area up to 10 meters without any obstacles 5. Power supply mode: Type-C interface 6. Interface type: AUXdual channelU diskTF card 7. Basic functions: Bluetooth receptionU disk playbackTF card playback 8. Built-in signal gain amplifier, room connection without dead ends, 10-meter transmission sound quality without delay, signal stability without lag 9. Equipped with a high-performance Bluetooth 5.3 chip, low-loss data transmission responds quickly and has stronger anti-interference, saying goodbye to delays, lags and other problems. 10. Compatible with various brands of U disk or TF card, plug and play stereo sound quality, no delay in transmission 11. Connect to the AUX interface of an old speaker or power amplifier to solve the problem of the speaker not having Bluetooth and being unable to use Bluetooth playback. 12. Built-in NFC sensor chip, the mobile phone can be connected in seconds. It supports mobile phones and tablets with NFC function to avoid tedious manual connection. 13. Dimensions: 68x58x21.8mm