WHELEN ( NOTHING BETTER ) MODEL UHF-2150 ALTERNATING ELECTRONIC FLASHER FOR HEADLIGHTS. LIKE NEW CONDITION. The flasher comes with instructions, IF you have daytime running headlights, otherwise known as ground switching, let us know we will send a flasher that will work with daytime runing lights! ( WE ALSO HAVE LOTS OF LIGHTBARS AND ETC. JUST ASK AND WE WILL PUT UP FOR AUCTION WHAT YOU WANT ). IT WILL NOT BE DOA. Never assume anything. If t are any problems you have 7 days to email us after you receive it. Ebay no longer passes on questions so if you have one just email thanks! Please note I make every attempt to satisfy my buyers however I know that I cannot satisfy everyone. BUT WE TRY. We no longer leave feedback per ebay new rules. What you see is what you get. We accept PAYPAL, and several other methods. Buyer to pay $9.50 shipping in the 48 states. Anyone with excessive complaints or a rating of less then 5 must email and explain before bidding on any of my items or bid may be canceled. THANKS