Hackclaw scan

How exactly does the Hackclaw scan works? What is the range of it? Does it also detect knocked down players? Does it work through the walls? Does it show you only moving targets/players?

I also saw a thread about it being bugged, happened to my squad too. No detection and after that we got wiped: https://www.reddit.com/r/DeltaForceGlobal/comments/1hmeihg/hackclaw_scan_bugged_in_operations_didnt_detect/