.Brand : Coms (Made in Korea) Shipping Weight : 4 ounces Enables two Devices to share one monitor or projector. OR, Enables two monitors to share one Devices. Easy to install. No power supply required. Connect 2 different devices to the DVI connection of the switch and select manually which device you want to put through. Only digital signal is passed threw DVI. Multiple simultaneous output to the monitor should not. (manual selection screen switching)