Hello, thanks for your interest in our products. The Protoshield is not compatible with Ethernet since the SPI female header connector could not connect Protoshield to Ethernet Shield. We will sell female to male header later later, you could get this

Yes, but this module can not program.

This wireless car key has 4 button, Codec-Adaptive Wireless Relay can remember 30 codes or buttons, so it is depend how you control with them. But yes, if you take each Relay remember one button of channel on the key then you can control Max is 4 Relay

It is use 12V LR27A battery.

Hi.We just have a instruction for this protoshield kit on our wiki,bu no more manual.

Sorry I see now the wiki page :)

Dear Derek levine.You can enter the wiki to find more information,and you can regard shields' surface as a reference.But we have not other docs.Thanks for your comprehension.

Hello, they are using the same transmitted codes. We are only distribute it , we do also not know how to change it .

Yeah ,it can only be hit one button to control multiple Codec-Adaptive Wireless Relays .

corrected pic

Awesome!

No.
"Kit is come with a nice Antenna???you can also purchase another Antenna with lager size"