... ,blue,amber,green and white is optional; (Led lightbar ,flashing light,vehicle light,warning light) Feature specification: 1)Work voltage: DC12V or DC 24V2 ... sign is very brightness, this warning light is popular! (Led lightbar flashing light,vehicle light)3)this warning light (warning sign) is very bright and ... . There is no need to drill unnecessary holes into your vehicle to install this bar