Zircon i65 Stud Sensor Center-Finding Battery Operated Stud and Metal Finder with Live Wire Detection AUDIBLE ALERTS: The sensor pings any time you hit the center of a stud STUD DETECTION: Can locate the edges and center of wooden or metal studs up to 1 1/2 inches deep LIVE WIRE DETECTION: An alert pops up in the corner of the display whenever the system detects electrical currents up to 2 inches under the surface LCD DISPLAY indicates when you are nearing the edge and center of a stud. It also tells you when re-calibration is necessary SPOTLIGHT: Visual cues in the form of a glowing arrow aid you in finding the location of metal and wooden studs