1/2inch Stud Scan Mode:Detects wood or metal studs up to 13mm deep 1inch Stud Scan Mode:Detects wood or metal studs up to 25mm deep 1 1/2inch Stud Scan Mode:Detects wood or metal studs up to 38mm deep Metal Mode:Detects metal up to 80mm for magnetic(60mm for non-magnetic)deep AC Mode:Detects live unshielded AC wires up to 51mm deep Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Metal Depth Indicator Green Backlight Low Voltage Indicator Battery Type:9V battery(6F22,not include) Operating Current:Less than 50ma Shutdown Current:Less than 10UA Automatic Shutdown Time:3 minutes 1. Detection Mode Selection Stud Mode In stud mode, there are 3 scan modes o choose for properly thick of the scanning surface: 1/2inch Scan Mode can detect 1/2 in. (13mn) deep. 1 inch Scan Mode can detect 1 in. (25mm)deep. 1 1/2inch Scan Mode can detect 1 1/2 in.(38mm) deep. If you don't know the depth of the detection, it is recommended to use 1/2inch scan mode first. When 1/2inch scan mode is not detected, use 1inch or 1 1/2inch scan mode instead. Metal Mode: The detection of magnetic metal can be as deep as 3.2 in. (80mm)(diameter 15mm galvanized steel tube) It can detect non-magnetic metals up tc 2.4 in. (60mm) (diameter 13mm copper tube). AC Mode: Detect unshielded AC live wire up to 2 in. (51mm) deep. Colour:Black Material:Plastic Size:About 165x74x40mm Package Contents: 1 * Stud Finder Wall Scanner Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.