VEVOR Air Horn Car Truck Train Chrome 3 L Air Horn Compressor Tank 12 V 120 PSI Train Air Compressor 4 Trumpet Train Air Horn Kit For Any Vehicle Trucks Car Jeep Or SUV https://www.amazon.com/dp/B085L3H9FL/ref=cm_sw_r_cp_api_i_vDFWEb54JJYGZ

Just needs a car battery.