From EngineHub.org Wiki
The MC1272 is a player detector. Its output goes high if a player or group matching (line 4) enters its range (line 3).
- Third line: Radius radius=x:y:z or radius, e.g. 1=-2:5:11. This can also be a WorldGuard region. Make it r:regionname
- Fourth line: Name of player or group. for players start it with p: and for groups g:
- High if detected