This handheld wall tester is designed to determine exact location of framing studs that are located behind the drywall. It will help you locate hiddened metal pipes, live wire, stud and metal frames accurately when you need to dig a hole to hanged a picture or install shelves. Specifications: Color: Black #43; Orange Material: ABS Display: LCD with Green Backlight Stud Mode: Detect studs with 3/4in, 3/2in, 2.36in and 2in mode Maximum Detection Depth: Wood or Metal Stud Scan: 0.75 #34; (19mm) Deep Wood or Metal Stud Scan: 1.5 #34; (38mm) Metal Scan: 2.36 #34; (60mm) AC Live Wire Scan: 2 #34; (51mm) Automatic Shutdown Time: Power-off in about 3 minutes when no button action and no object scanned Indication: Low batterys indication beeper indication Working Current: lt;50ma Standby Current: lt;1ua Operating Temperature: -20 #xff5e; 50 Storage Temperature: -20 #xff5e; 50 Power-Supply: 1 * 9V 6F22 Batterys (Not Included) Item Size: Approx. 167 * 75 * 38mm / 6.6 * 3 * 1.5in Item Weight: Approx. 148g / 5.2oz Package Size: Approx. 185 * 80 * 50mm / 7.3 * 3.1 * 2in Package Weight: Approx. 205g / 7.2oz Packing List: 1 * Wall Stud Finder 1 * English User Manual