This InteliSensor Stanley Stud Finder can make your home improvement tasks simpler and easier. The LED display and buzzer help to detect the stud edge and locate joists up to 3/4" through drywall and other common wall material. It is pocket-sized, making it easy to carry and store. The 77-110W stud finder tool also comes with a high-impact, ergonomically designed ABS case and a pencil notch for pinpoint marking. This device automatically calibrates to ensure accuracy. The wall stud finder has a warning light to indicate when the battery is low.