As I see it, you can only transmit 1080p here, which is Full HD. I hope I could help you LG Michael

Should work like this, yes. So far I have only had problems when I connected a hdmi splitter or to an amplifier. Then it interrupts at the beginning but directly from the source I haven't had a problem yet.

Yes, it works! We also use VGA to HDMI converters and also DisplayPort to HDMI. The converters may require their own power supply (USB or PowerSupply) to provide the required HDMI signal to the Optoma transmitter. The transmission quality and reliability of the Optoma WHD200 is excellent. Please use high quality HDMI connection cables and connectors. This is the only weak point of the system found so far, the HDMI connectors! If you take care here, you will have great pleasure in the product.

Yes, it works for me. It is important that the switch automatically changes between the channels and is 3d capable and that it can be changed manually if the device is not addressed. However, multiple devices at the same time does not work.

Yes, a power supply unit is included. I cannot answer the other questions. With kind regards Crown longe

At 5m, the device will definitely work through a wall.