The Earth and Constellation Globe has an automatic light sensor so when the globe is turned on and the surrounding area is dark the globe will transform into a beautiful glowing globe showing the star constellations. There is also a handy override switch which allows you to turn off the night-time view and thus conserve battery power. You can also purchase an electrical adaptor separately (not included) that you can plug into the globe and power it off mains electrics. Each box contains a specification to enable you to purchase such an adaptor. The Earth and Constellation Globe is a great learning tool for geographers and astronomers but also a great feature for any bedroom, living room or study. A truly unique globe. The ideal gift for would-be astronomers and budding geographers.Unique globe shows planet Earth by day and transforms into a constellation globe at night22.8cm world map showing geographic features by dayBy night, in a dark room, the illuminated star map shows constellationsLight sensor automatically turns globe to night feature when dark