Add-on assembly, identification method for add-on assembly, and wearable device

A wearable device, comprising:

• a device main body comprising a magnetic field sensor, a processor, and a magnetic adsorption fitting part;
• and
• an add-on assembly, comprising multiple different sub-assemblies, wherein each of the sub-assemblies comprises a magnetic adsorption part, the magnetic adsorption part of each of the sub-assemblies is used for adsorbed-connection with a device main body of a wearable device, the magnetic adsorption parts of any two of the sub-assemblies are different, and each of the sub-assemblies is identified by the device main body through the magnetic adsorption part,
• wherein the magnetic adsorption fitting part is configured to be in the absorbed-connection with the magnetic adsorption part of one of the sub-assemblies, the magnetic field sensor is used for acquiring a magnetic field signal when the magnetic adsorption part and the magnetic adsorption fitting part are in an adsorbed state, and outputting the magnetic field signal to the processor, and the processor is configured to identify the one of the sub-assemblies according to the magnetic field signal,
• wherein the multiple different sub-assemblies are configured to realize additional functions other than main functions of the device main body.