Bluetooth dongle is an external device, usually in the form of a USB plug or other interface, that enables devices without Bluetooth functionality to communicate wirelessly with Bluetooth devices. Its main function is to add Bluetooth functionality to the device, thereby enabling wireless connection and data transmission between devices.

The functions of the Bluetooth dongle include but are not limited to the following aspects:
Bluetooth function extension: The Bluetooth dongle can add Bluetooth connectivity capabilities to devices that do not have Bluetooth functionality, allowing them to communicate with other Bluetooth devices. For example, connecting a Bluetooth dongle to a computer without Bluetooth functionality allows the computer to connect to Bluetooth devices such as a Bluetooth keyboard, mouse, and headphones.
Device interconnection: Through Bluetooth dongles, users can achieve wireless connections and data transmission between different types of devices. This connection method is commonly used to connect a Bluetooth dongle to a TV, audio system, or car audio system for audio transmission or data sharing with smartphones, tablets, and other devices via Bluetooth.
Enhanced device compatibility: Some older devices may not have built-in Bluetooth functionality, and Bluetooth dongles can provide these devices with modern connectivity options and enhance device compatibility and functionality.
Convenience: Bluetooth dongles are usually easy to install. Users only need to plug it into the corresponding interface of the device to quickly add Bluetooth functions without complicated installation steps or configuration processes.
In general, a Bluetooth dongle is a practical external device that adds Bluetooth connection capabilities to devices that do not have Bluetooth capabilities, enabling wireless communication and data transmission between devices, improving the functionality and convenience of the device.
Bluetooth dongles and Bluetooth modules are both related to Bluetooth technology, but they have some differences in working principles, application scenarios, costs, etc.
Here is a comparison of Bluetooth dongles and Bluetooth modules:
| Features | Bluetooth dongle | Bluetooth module |
| working principle | Add Bluetooth functionality to your device via an external connection | Integrated directly into the device as part of the device |
| Application scenarios | Used to add Bluetooth connectivity to devices without Bluetooth functionality | For the design and production of devices that require Bluetooth functionality |
| Connection method | Connect to the device via USB plug or other interface | Integrated directly into the device’s circuit board |
| cost | Usually low cost, suitable for scenarios where Bluetooth functionality needs to be temporarily added | The cost is relatively high and suitable for scenarios where the device requires long-term Bluetooth functionality. |
| flexibility | Can be used on a variety of different types of equipment, easy to replace and upgrade | It needs to be considered and integrated into the equipment during the design stage, and it is not easy to replace and upgrade. |
| degree of customization | Usually does not provide customization options and has strong versatility | Can be customized according to equipment needs to meet the needs of different application scenarios |
| portability | Easy to port to different devices | Once integrated into a device, it is not easily portable to other devices. |
| Installation and configuration | Easy installation, plug-in design | Need to be considered and configured during equipment design and production stages |