1. Chip: RTL8761B 2. Interface: USB2.0 3. Bluetooth version: 5.0 4. Transmission frequency: 2.403-2.480GHZ 5. Transfer rate: up to 3MBPS 6. Transmission distance: about 10-20M without obstruction 7. Support system: WIN7/8/8/8.1/10 8. Features: wide compatibility, long transmission distance, stable connection, need to install the driver to use 9. Weight: about 18g/piece 10. Size: about 29x15.4x6.2mm
