... 2. simple control button, CE/ROHS certificate approval.LED writing boardA kind of fashionable new LED advertising board, the board ... time.Usage:1.For advertising especially for promoting new items in restaurants, dressing shops, bars, clubs, theater, museum, book ... , hairdressers, commercial centers, night market etc.2.For notice in school, companies, classroom, metrostation, resident place etc.3.For ...