Abstract: There is provided a device for checking the lifetime of household electronic or electric appliances. This device checks actual energization time and enhances the lifetime by improving the likelihood of service at optimal intervals. The device includes a sensor for outputting signals indicating that the electronic or electric appliance is energized, a memory storing energization time, a signal input unit for inputting inquiry signals from a user wishing to check the lifetime of the electronic or electric appliance, a display, a microprocessor for determining accumulated energization as a function of signals from the sensor, storing an updated energization time back into the memory, and selectively controlling the display to display the energization time.