RAYEE K8 Bluetooth 5.0 Audio Receiver & Transmitter 2 in 1 Adapter Support 2.1A Fast Charge U Disk, US Plug 1. Material: PC plastic 2. Usage: 110-220V power supply in-line 3. Transmission rate: 2.40Mbps 4. Bluetooth transmission distance: about 10 meters 5. Bluetooth version: 5.0 6. Working frequency: 2400MHz 7. Interface type: 3.5mm interface 8. Output parameters: DC 5V2.1A 9. Support protocol: A2SPAVRCP 10. Basic functions: Bluetooth receivingtransmitting, APP control, U disk playback, 2.1A fast charge 11. Scope of application: notebook computers, desktop computers, projectors, televisions, subwoofers, small speakers, power amplifiers, wired headphones and other devices with audio inputoutput interfaces 12. Size: about 7.5x5.5x2.5 cm 13. Weight: about 54 grams Features: 1. Using Bluetooth 5.0 chip 2. Support Bluetooth receiving (RX) and Bluetooth transmitting (TX), two functions in one 3. Both receiving and transmitting modes can be played by plugging in U disk, supporting mp3flacwavwamape and other formats 4. Mobile APP control, up and down songvolume adjustmentsound effect adjustmentplay source switching 5. Support 110-220V power supply in-line, universal 6. Built-in QC2.0 fast charging module, supporting 2.1A dual USB fast charging, easy charging for mobile phones, tablets, etc. 7. Small and portable, does not take up space, wear-resistant and durable 8. Built-in high-quality decoding chip, high-definition stereo sound quality 9. Intelligently compatible with various devices, plug and play, suitable for devices with audio inputoutput interfaces 10. ABS multilayer protection, PC fireproof material 11. Built-in large-capacity resistance protection, not easy to get hot, safe circuit