12V, 24V auto reversion horn 1,Back horn for cars/trucks/electric car 3,SPL:120dB 4,sound: ... ..,bee bee,lambada, 5,rohs 1,12V/24V back up horn, reversion horn2,Product Model: BB-4013,Operating Voltage: DC 12V ... :Black/White9,Material:ABS china best quality,Do Do reversion horn BB-401