The car horn sound effect controller can adjust 15 horn sounds, allowing you to customize the sound of the car horn. [Car Horns Controller]: This Electric Horns Controller for vehicles is designed to enhance your vehicle's audio system and clear and loud sound output. [Material]: Crafted from plastics, this car horns controller is built to withstand the rigors of daily use. Its sturdy construction ensures long time durability. [Adjustable Volume Levels]: Each sound effect of the electric horns speaker comes with its volume level, giving you the flexibility to choose the good volume for any situation. [Easy to Install]: The Electric horns speaker can easily connect to various car speakers, supports 12 - 24V working voltage, and is suitable for different models. Voltage: 12-24V Colour:Black Material:plastic Package Contents: 1 x Car Horns 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.