Description:GRAPHICAL LCD: Which can show you details include AC Wire Warning/Stud Mode Indicator/Low battery Indicator/Metal Mode Indicator/AC Mode Indicator/Stud Deep Mode Indicator/Moving Direction Indicator/Stud Edge Indicator/Stud Center Indicator, when the battery level is low, stud finder will remind you to replace a new 9-volt battery (not included).SOUND NOTICE: The multi function stud finder notice with the BEEP SIGNAL ALERT. When you have detected an object with the wall scanner, the most Middle bars on the screen and a steady beep will sound, notice you object is in the wall.OPERATION: You can use the pencil which include in the package to point the location of the object. The audible and visible cues reliably keep users informed when any object, such as metal, studs, AC live wiring gets found.AUTOMATIC CALIBRATION: Stud finder can be calibrated anywhere on the wall. It automatically recalibrates, when needed, to successfully find the center of studs in one step. Place unit flat on the wall. Press and hold the ON/OFF button. Do not move the unit until calibration is complete, about 3 seconds. All indicators on the LCD are displayed while the unit goes through its about 3 seconds calibration cycle. Following the completion of calibration, the unit will beep, and the selected mode icon will be shown on the LCD.APPLICABLE: The Multi-Function Wall Scanner can quickly locate edges and center of metal studs, pipes, rebars, joists behind walls, floors and ceilings, also indicates the presence of live AC wire.Specifications:Item Name: Stud FinderColor: GreyShell Material: ABSBattery Power Supply: 6F 22 9V battery (NOT INCLUDED).Battery Life:1 year with normal useWorking Temperature: 19120(-749)Storage Temperature: -4150(-2066)Quantity: 1pcHOW TO USE?Step 1: Load 6F 22 9V battery (NOT INCLUDED). Turn it on.Step 2: Choose the scanning mode.Step 3: Press before each scan. The bars indicated on the screen will go from full to none.It beeps once to indicate that it has been successfully calibrated.Do not let go of the button during calibrating.Step 4: Move slowly on the desired surface. It beeps continually if the object has been detected.ATTENTION:1. The measuring range for alternating current is 85-240 volt, sometimes the alternating current will influenced by environment, humidity or others which will also influence the measuring accuracy.2. If you know that there are lines in a particular location, but you can not find them with the sensor in "AC" mode, then use "METAL" mode. Electrical lines may be shielded by metal cladding.Wiring. This Item features Five scanning modes:Stud scan 1: Locates the center and edges of wood studs up to 1/2in. (13 mm) deep.Stud scan 2: Locates the center and edges of wood studs up to 1 in. (25 mm) deep.Stud scan 3: Locates the center and edges of wood studs up to 1 1/2 in. (38 mm) deep.Metal scan: Detects metal (such as 1?2 inch rebar) up to 2.36 in. (60 mm) deep.AC scan: Detects live unshielded AC wires up to 2 in. (51 mm) deep.Note:There might be 1-3 cm error of size for manual measurement.The colors deviation might differ due to different monitor settings, please kindly understand.Packing list1 x Stud Finder