Use this relay harness to avoid the of installing after-sales speakers. This relay kit will make installation easy! This harness allows you to to use existing and aftermarket speakers, while maintaining your horn buttons with a simple setting. Since most car only has one horn,if you install an extra pair of horns,it is necessary to use this relay harness kit.This relay harness kit will minimize the modification and make the installation super easy! Connect up to two horns easily and long lasting. Universal for most grille mount electric blast horns. Heavy duty, High efficient, Heat resistant, Never Voltage:12V Colour:As shown Material:Metal + plastic Package Contents: 1 * Horn Wiring Harness 2 * Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.