With a HART stud finder, you have the fastest, easiest, most accurate stud finder on the market. To operate the HART Basic Stud Finder, put the unit securely against the wall and then press and hold the button. The unit will quickly calibrate. Once you have it on the wall, the LEDs show you the center studs. When you move the unit back and forth, the signal strength will increase as you approach the stud center and red LEDs will illuminate in sequence until the HART Basic pinpoints the center of the stud. When you have found the stud center, the green LED will illuminate. HART stud finders are the most accurate stud finders because they have more sensors. Other stud finders typically have only 1 or 2 sensors. The HART Basic has 3 so you can find stud positions with unbeatable accuracy. The display allows you to see the center of objects such as single studs, wires and pipes.  The HART Basic is the perfect tool for many projects ranging from installing towel rods and curtain rods to hanging pictures. Battery Powered, Not included.  Assembled product weight is 2.88oz.