Looking at a few different 12V PIR Switches
Sponsored by JLCPCB ($2 for 10 Boards): https://jlcpcb.com
Three different PIR switches designed for use with 12V lighting systems. Two of them use a relay for switching the load, the other one uses MOSFETs.
Data sheets:
http://www.sc-tech.cn/en/CS9803.pdf
http://www.ladyada.net/media/sensors/BISS0001.pdf
http://www.din-tek.jp/Upload/Product%20Doc/Datasheet/DTU09N03.pdf