... PC,digital visual presenter,write screen,LCD,projector.saving place and easy to control. Noticewireless mike,electronic ferula,write screen, ... one key control,equipment open to use,easy to operate.safety and easy to defend:mobile design,can push to anywhere,closed ... screen or LCD.integration:mouse,hand writing board and chalk,easy to handle.Technic parameter:in PowerAC220V±10 50Hzdrive powerDCl2V 12. ...