... displayThe monitor dust, anti-theft protection effect. AM LCD lifter appearance simple and elegant, classic style, ... shockproof performance;4. Our regular size is 17", 19", 21", other size can be customized;5. ... RS232/RS485 connectors are equipped;8. This LCD lift can be used with conference table& computer ... shockproof performance;4. Our regular size is 17", 19", 21", other size can be customized;5. ...