The Car Siren Horn by JDMSPEED is a modern and stylish emergency speaker system designed for vans. With a powerful 115 dB noise level and a wattage of 100 watts, this siren horn emits a clear and loud 7-tone sound to attract attention in emergency situations. Its universal fit design makes it easy to install with a voltage of 12 volts, ensuring safety and security on the road. The compact dimensions of 7.09 x 6.69 x 2.36 inches and lightweight design of 1.32 pounds make it convenient for use in various vehicles. All I can say is my ears are still ringing!!!! This thing is loud!!! It scared everyone in the house when I tested it.