The ProSensor M50 has the look of a more conventional stud finder but with the accuracy and tracking capabilities of our patented Multi-Sense Technology. The ProSensor M50 also has Live Electrical Warning and will light up the warning lights if it detects live electricity in the area. It has a max detection depth of 1.5 inches and an 2.25 inch horizontal LED display to instantly show the center and edges of studs with no calibration required. The M50 runs on AA batteries (not included).