A battery operated lighter equipped with a battery operated timepiece which includes a lighter ignition circuit and a timepiece circuit wherein a switch is used in common for selectively manipulating the lighter ignition circuit or the timepiece circuit.

A battery operated lighter equipped with a digital timepiece including an ignition circuit for generating an electric spark to ignite a lighter fuel, a timepiece circuit being electrically connected to the ignition circuit and adapted to operate a digital time display, a casing for housing therein the ignition circuit and the timepiece circuit, and a circuit for preventing a noise signal caused by operation of the ignition circuit from affecting the timepiece circuit.

An electronic calculator watch which comprises timekeeping means composed of an oscillator, a frequency divider connected to the oscillator, a counter circuit connected to the frequency divider, and a driver circuit connected to the counter circuit for providing an output signal indicative of time information, and calculating means composed of an oscillator circuit and a calculation circuit responsive to perform calculations under control of numerical inputs furnished by external operation device provided on a watch case. The watch also comprises a display including a first display section connected to the driver circuit of the timekeeping means to display the output signal delivered therefrom, and a second display section connected to the calculating means to display the result of calculations, each of the first and second display sections having a plurality of digit electrodes and a plurality of segment electrodes arranged in a matrix configuration.