Working Principle: A sealed glass container contains several transparent solutions the liquid can predict the weather. The change of external temperature is the most important factor in crystal change. Dazzling Decoration: Made of high-quality borosilicate glass and beech wood the storm bottle went from transparent to turbid to crystal clear. The stylish storm bottle brings a new approach to natural weather forecasting. Robert Fitzroy Invention: The weather forecast bottle was first invented by British Navy Lieutenant Robert Fitzroy. The storm glass bottle can predict the weather changes in advance so that he can reach his destination smoothly. Wide Application: The storm bottle is very suitable for the living room bedroom study kitchen office bar restaurant or hotel room. It can also be used as a gift for birthdays weddings and festivals. Product Information: The storm glass has 2 colors that can be chosen from transparent and black and you can choose the color you like. The size is about 7.5 x 5.5 x 9.5 cm / 2.95 x 2.16 x 3.74 in.