I purchased these new to replace the horn in my car, but the horn has already been replaced with an aftermarket one, so I am selling these. These are slim design horns, 30mm thick, that emit high-pitched sounds of 550Hz and 440Hz. - Brand: MITSUBA - Model Name: SLIMSPIRAL II - Frequency: 550Hz & 440Hz - Thickness: 30mm - Voltage: 12V Thank you for looking.