Electronic Multi-tone Siren Horn 1.make,export 10years,8new ... material and thickness: Iron, 0.8-1.2mmElectronic Multi-tone Siren Horn1.make,export 10years,8new horn/year2. ... with 2 national patent. can be made to be multi-tone horn(two color,red and black)DL-VW ... Universal Multi-tone auto horn, several sound option ,Non-contact, long life ,super water proof sound crisp elegance Electronic Multi-tone ...