... . Power Supply: DC 6V/500MA power supply, external power, built-in button batteries, when power normal travel time.Specifications:The digital clock ... .4, 12 / 24 hour free to switch. In the normal display state, press the button (DOWN) to conversion, when12-hour ON, the ... indication lights up when it is afternoon.5, built-in CR2032 button battery (under normal circumstances, it can work 4 to ...