A Bluetooth device, which realizes different types of device by setting a MAC address of the device or a type of a broadcast device; when the device is used as a Bluetooth keyboard device, it can realize a function for inputting a dynamic password, and the device shifts an obtained dynamic password value into Bluetooth keyboard class virtual key information according to the Bluetooth keyboard protocol, and sends automatically the virtual key information to the upper computer successively, and the device can restore a type of the device so as to resolve a keyboard conflict between the keyboard device and the upper computer, in this way, the user makes less error to input a dynamic password and the identity authentication becomes safer.