Indoor Purpose LED Clock has selectable 12 or 24 hour display format and has internal battery backup that maintains time during a power failure; the clock will start to display accurate time as soon as the power is restored. The LED Clock has heavy duty black powder coated aluminium frame and simple push buttons to set time and alarm. The LED Clock has 12 VDC socket for use in automobiles. The Indoor Purpose LED Clock has 99 minute stop watch function.