A Bluetooth dongle is a small device that plugs into a computer's USB port and provides Bluetooth connectivity.It enables the computer to communicate wirelessly with other Bluetooth devices (such as wireless headphones, keyboards, mice, etc.). Same functionality as nRF52840 dongle Supports buttonless built-in USB bootloader Including BLE application, RSSI Viewer, etc. Model Number:nRF52840 dongle Working Frequency:2.4Ghz IC:nRF52840 interface:Type-A Application:BLE/RSSI Working Current:12mA The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:ABS Package Contents: 1 * Bluetooth USB Dongle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.