... and it burns for hundreds of hours with built-in high quality rechargeable battery. With a single ... 2. To USE the LED lamp on the built-in rechargeable battery, either unplug the LED lamp ... on both Standard AC Power and also on built-in Rechargeable battery(DC Power). 4. The ... and commercial locations 2) Hotels, conference rooms 3) Factory, offices, houses 4) Airport, metro station 5) Schools, hospitals ...