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info Stanley
Status center LED
The stud sensor has found the center of a wood or metal stud (long beep) while AC detection might also be present, giving short alternating beeps.
? What Causes This
Proximity to wooden or metallic structures along with potential live wires being correctly identified within 12”-18” (.3m - .5m).
ⓘ What This Means
Continued use without action required. Ensure correct positioning and reading for marking accurately on walls.
Source: page 6 of the official manual
From the manual
This error code appears in:
Stanley FatMax PP1DCS Portable Power Station Jump Starter