An electronic audible warning device (10), which includes a power source (18), a motion detector (401), a pleasant tone generator (100, Q1, Q3), a loud piercing tone generator (100, Q1, Q2) and a remote push button activation switch (19) is disclosed. Signaling device (10) provides two distinct features,...http://www.google.de/patents/US5262757?utm_source=gb-gplus-sharePatent US5262757 - Electronic signaling device for bicycles and the like
