... . Brightness is dimmable4. Transformer supports 110V - 220V Voltage, AC power 5. Alarm functionVery good choice for using in the office ... di di di di4. Power Supply: DC 6V/500MA power supply, external power, built-in button batteries, when power normal travel time.Specifications:The ... will return to the initial status.it is comes with power adapter. If No electricity, there is an internal battery for ...