Shenzhen Langheng Tech. Co., Ltd We engage ourselves in prolonging and transferring the connections of computer video, audio, keyboard, mouse, USD, DVI, networks. Etc. Our products which we have promoted in our market are VGA Video Extender, Audio Extender, KVM Extender, Keyboard & Mouse Extender, USB Extender, DVI Extender, KVM Switch, Keyboard & Mouse Extender, VGA Video Splitter, Video transmission, Twist-pair transmission etc. Our high quality and low price products are widely used for supermarket monitor, safety guard, hotel management system, video monitor, video matrix, projective meeting, large screen display system, advertising information publishing system, power station.