Had already smaller lamp in which then, however, the thread broke. Property me this mainly bought Therefore, because there is now a separate on / off switch, so you no longer have to turn on the thread! Is a great replacement lamp and also fits into any jacket. In a pinch, she goes as Erstlampe - had given my buddy whose lamp was broken. The nice thing is that you can also use them above water without any problems longer, without being too hot.