Electronic device

An electronic device adapted to be detachably assembled to a lamp holder, wherein the lamp holder comprises a lamp socket, and the electronic device comprises:

• an adaptor module comprising a lamp connector corresponding to the lamp socket, a first connector electrically connected to the lamp connector, and a first engaging member adjacent to the first connector;
• and
• a functional module comprising a second connector and a second engaging member, wherein the second engaging member of the functional module is detachably connected to the first engaging member of the adaptor module, and when the functional module is assembled to the adaptor module, the second connector is electrically connected to the first connector,
• wherein when the functional module is in an initial position, at least one portion of the second engaging member is misaligned with the first engaging member, and when the functional module is rotated to a locked position, the second engaging member is slid into the first engaging member, the functional module is detachably fixed to the adapter module by an engagement between the first engaging member and the at least one portion of the second engaging member.