Streetwize Swhh Hand Horn Clam Pack Dual Purpose Air Horn and Air Compressor from Streetwise. This hand held air horn is the ultimate eco friendly horn.With this air horn you don't need a gas cannister, so its not expensive to run either. Screw the horn to the air pump release the handle then push the handle to get an ear splitting blast of the horn. Now this is where you can really save money because you can also use this to pump up your bicycle tyres and inflatables. Attach the hose to the pump, release the handle and away you g Great for use at sporting events, regattas, festivals and much more.