... power is off, it almost likes a cell phone effect. 3. Energy saving, environmental protection, it ... DC 6V/500MA power supply, external power, built-in button batteries, when power normal travel time.Specifications ... , the alarm clock. Snooze interval rings are free to choose (1 to 60 minutes, the default ... the alarm function.4, 12 / 24 hour free to switch. In the normal display state, press the button ...