Hella - relay for 24V sound sequence. Design: Special relay Voltage: 24 V The sound sequencer is used to control the transonic horns in ambulance, fire and police vehicles to generate the Cis-Gis warning signal. CHECK OUT MY OTHER ITEMS. This item is in the category "Automotive\Parts & Accessories\Car & Truck Parts & Accessories\Interior Parts & Accessories\Switches & Controls". The seller is "fletcherelectronics" and is located in this country: CA.This item can be shipped worldwide.