Two glasses very classy and comfortable to touch that appear each contain a small candle whose flame will even oscillate. Are switched on by turning the glasses upside down and they are switched off in the same manner. A small white lacquered tray receives the necessary to recharge the batteries at power LEDs. Completely decorated and therefore not essential except for a touch of light and make a warm interior. Question ecology is spent on electricity (very few, they are LEDs) but it does not emit CO2. So just for fun ...