Designed for effective warning in areas without power supply. Maximum sound with a minium of effort. Misceallaneous applications e.g. schools, public buidlings, camps, rescue, firefighters, road works etc. Folds up to small size. Made of aluminium. Dimensions closed approx. 125 x 125 x 130 mm. Weight 1.200 g. Sound rating (1m): 110 dB (+/- 2). Output frequency 550 Hz (+/- 20 Hz). Canvas bag included.