Old 12volt siren taken off a 1950s motorcycle years ago when I restored the bike to standard. It's been under my bench ever since.1970s. It works fine and creates a lot of noise sure to impress your neighbours. There is no gauze or guard over the openings so unwise to handle when operated. It would need a relay, probably over 25amp and suitable size wire as well. Dimensions on the photos. Siren is aluminium except for the motor body which is steel, the clamp is stainless steel. It is not legal to operate sirens on the UK roads. So there it is quite rare thing
