Car Horn 1 to 2 Connector Converter Wiring Harness, Compatible with Toyota Corolla, RAV4 (LE/XLE), Tacoma (SR/SR5), Highlander (L/LE), Horn Splitter Adapter Plug and Play Single to Dual Horns. 【 1 to 2 Horns】This car horn splitter fit to add a second horn-low tone to the existing single high tone horn, easy to upgrade your factory horn to a nice loud dual horn.