The emergency & utility whistle was specced against the way this space is actually used, not against a brochure. At a glance Type: Whistle Power Source: USB Lumens: 2000 lm Run Time: 4 Hours Price: à§³25.16 The part most missed Set up as a whistle-class unit, it does the job without asking you to improvise. In practice First use: no break-in ritual required beyond a quick wipe and a glance at the label. Care: a rinse and dry cycle in the usual rhythm keeps it looking fresh. Storage: stows neatly, taking no more room than a loaf tin when out of service. Order it, use it for a week, and it becomes furniture rather than a purchase.