Usage Tips:[Car Horn Controller]: This car electric horn speaker controller is designed to enhance your vehicle's audio system and a clear and loud sound output. [ Material]: The horn sound control unit adopts premium plastic shelling, sturdy construction ensures long time durability. Copper contacts, good conductivity. [8 Sound Adjustment]: The car horn control switch has 8 different sound effects and volumes to choose from, easy to operate. [Easy Installation]: The car horn controller is equipped with a line control switch, is easy to install and can be easily connected to various car horn. [Wide Applications]: 12V-24V universal musical electronic horn controller, suitable for cars, boats, emergency vehicles, trucks, etc. Note:Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color:Black Material:plastic Package Contents: 1 * Horn Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.