Stanley 77-115 IntelliSensor Plus Stud Sensor N/A Imported Stud Sensor 150 Staples!!!! Unique speaker feature provides audible sound when locating studs High-visibility LED indicates precisely when stud edge is located Unique speaker feature provides audible sound when locating studs High-visibility LED indicates precisely when stud edge is located Multimode panel ensures accurate depth indication New, quick-response ASIC technology improves reliability. High-impact ABS case built for strength and durability Limited Lifetime Warranty