With a Bluetooth HID module you can connect to your arduino projects to your Cell phone or computer and get it to behave like a Mouse/Keyboard or game pad device. The feature we are most interested in is that the module can work as a HID device.
They do however use the exact same chip as modules that are more feature rich, so it is possible to re-flash them with the firmware of these modules to get the same features. They are pretty basic modules though and don't support too many features. The HC-05 and HC-06 are really common Bluetooth modules used in Arduino projects, they are very easy to connect to and are only about $3 each.
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