An electronic device includes a housing, a function module, and a mechanical lock. The mechanical lock includes a lock shell, a plurality of lock wheels, a lock axle, a first conductive component, and a second conductive component. Rotation of the lock wheels to an unlocking state permits movement of the lock axle between two positions, where the first conductive component and the second conductive component are electrically connected or disconnected. When the first conductive component and the second conductive component are electrically connected, the function module is able to electrically connect to a power source so as to obtain electrical power therefrom.