Febi Bilstein Car Signal Electric Horn 110 dB (107770). This genuine OEM quality horn is a single unit, designed for vehicles requiring a low tone signal at 405 Hz. It operates on 12 Volts and measures 83 mm in length, 90 mm in width, and 77 mm in height, with a weight of 0.20 kg. Always check product compatibility with your vehicle before purchase. Please observe all restrictions. Solutions Made in Germany.