This double flash strobe light meets the USPS policy set forth in accordance with rural duties and responsibilities. Each 12V light measures 5" in diameter and features a 15' coiled cord and cigarette lighter plug with a built in on/off switch. The magnetic base allows this strobe to securely attach to vehicles when in use, and be removed when not. Easily identify yourself as a postal vehicle with this safe double-flash strobe light. Ships USPS Insured.