If you've never purchased a light directly from 4sevens' website, or if you don't frequent their subforum here, there's a good chance you don't know about their new titanium whistle. I received mine earlier this week. Let me say that it is seriously loud (advertised to be 100db) while also being minuscule in size. It is the perfect keychain whistle. The only negative right now is that it is currently on backorder after only being available for less than three weeks.