CAU = CyberAgent Universe
AH = is a randomly selected code referring to the era/side-story that the design relates to. "A" usually indicates "universe A" which is the original time line of the CyberAgent Knights/Samurai/Guardians rather than an alternate universe or parallel future. The "H" in this case relates to the CyberAgent PolicePatrolMecha arc which is normally indicated with the reference CAU-AH
You may notice some designs are CAU-AG, this means they are designs that were in use during the CyberAgent Guardians era, they may have operated without the PolicePatrol's awareness or have been dealt with by other civilian agencies during that time.
Actual dates for these two eras need to be established. But we are looking at mid 22nd century to early 23rd century possibly.
The Mobile sentry is a fully automated drone which serves as a sentry post/gun emplacement for security of large installations owned by the PowerAll corporation. For ease of deployment, and to reposition during an attack, the unit can partly convert from a static mode, to a four wheeled tank mode. (shown above are two different configurations of the mobile mode).
They mostly function as anti-aircraft emplacements, though they are also capable of scanning and deterring ground forces and mecha.
Unlike the units of the CyberAgency, Sentry units are completely artificial in nature, as such they are relatively limited tactically. They have simple enemy recognition software and will continue to attack until instructed to stop, or the target has been rendered inoperative. They have been known to chase enemies, deserting their posts in the process. A software glitch that can be exploited to create gaps in PowerAll defences.