Precision Sensors Stud Finder Professional Deep Scanning LED Profinder 5000 Instantly detects wood, metal, and other hidden objects. Batteries included. One-step operation: Hold button down to turn on. Place on wall and the LED lights will locate studs Has more sensor pad area than conventional stud finders to detect more accurately Senses hidden objects with, or without, sliding across the wall. Advanced technology senses the wall in multiple locations simultaneously to find location of studs