ELECTRIC DEVICE

An electric device includes: an electric circuit; a power supply circuit configured to feed electric power to the electric circuit and stop the feed; and a housing containing the electric circuit and the power supply circuit. The power supply circuit is configured to, in response to a first operation performed from outside the housing while the power supply circuit is in an OFF state, the OFF state being a state in which the battery feeds no electric power to the electric circuit, transition to an ON state, the ON state being a state in which the battery continuously feeds electric power to the electric circuit even after an end of the first operation, and in response to a second operation performed while the power supply circuit is in the ON state, transition to the OFF state.