1. Uses a special sensor that pinpoints the edges of wood studs behind walls or ceilings. 2. Calibrates instantly for immediate use 3. Bright LEDs and an audio signal indicate stud edges 4. Made to withstand daily jobsite use. 5. Fashionable design for easy to use and hold 6. Accuracy:typically within 1/8 in. (3 mm) using the dual scan and mark procedure 7. Battery type:9-V alkaline (not include) 8. Depth:Up to 3/4 in. (19 mm) in Stud Scan mode 9. Operating temperature: 20° to 120°F (-7° to 49°C) 10. Storage temperature: -20° to 150°F (-29° to 66°C 11. Humidity:80% RH (noncondensing) 12. Water resistance:Splash and water resistant, not waterproof Product Size: 106*72*32mm