For 2 outputs into one input normally you need an electronic switch of the handshake between the devices re-taught. However, most of the low-cost switches are on the market unreliable cheap scrap.
This switch is also built here cheap, but it works purely mechanically. Excellent! For now I can without any problems. 1080p from my LG TFT screen or my Sony LCD TV (1080p) switch back and forth!