... the product Product name: ali express tricolor high quality led wireless taxi roof signs 1,ali express taxi roof signs2,tricolor ... high quality taxi roof signs3,led wireless taxi roof signs4,with CE ROHS5,Screen size(L*H*D): 230*98*90mmProduct ... RS232(free),( you can choose RS485, USB, TCP/IP, Wireless communication )the screen can display text, display images, display time, display temperature ...