A safe toy, no batteries needed, good for scaring cats off of kitchen counters. From Wikipedia:
An *air vortex cannon* is a toy that releases doughnut-shaped air vortices ( https://en.m.wikipedia.org/wiki/Vortex_ring ) — similar to smoke rings ( https://en.m.wikipedia.org/wiki/Smoke_ring ) but larger, stronger and invisible. The vortices are able to ruffle hair, disturb papers or blow out candles after travelling several metres.
AirZooka air blaster (Germantown 20874)
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