This adapter cable is used to connect a 3.5mm trigger port on a compatible projector with the RJ-45 port of a motorized projector screen. Upon power up / down of the projector, the trigger port will command the motorized screen for an up / down screen move. This cable adapter is the 12V version. Most projectors (e.g. Epson 8350) and motorized projector screens (e.g. Elite Screens) are compatible with this cable adapter. Connections: - RJ-45 male connected to the motorized projector screen port - 3.5mm female connected to the projector trigger port (through a regular 3.5mm mono adapter cable, not included here).