Features: High accuracy, stable performance, long service life. Suitable for use in interior decoration structure, can detect the location of metal and AC-wire in wall. Suitable for use in interior decoration structure, can detect the position of metal and wire in the wall, when the induction of metal and voltage-, the instrument will flash and sound prompt. When there is no metal or voltage- loop nearby, it will not flash or sound. When the test is complete, turn off the power-supply. The detector should not test AC-voltage- in metal pipes, metal wall or deep part. Specifications: Material: Plastic Battery: 6F22 9V Battery(NOT Included) Metal Scan: 24mm in Depth for 15mm Diameter Steel Tube(Reference Value) AC-Wire Scan: 40mm in Depth for 400V Wire(Reference Value) Working Condition: -20 to 60, 30 to 80%RH- Size: Approx. 148x82x25mm/5.83x3.23x0.98in Note: The detector can test and locate the AC-voltage- of all devices, and these tests are safe. The detector must not test AC-voltage- in metal pipes, metal wall, or deep component. When the detector has not been used for long period, please take out the battery inside. Please do not hit the detector with force. Please make sure that you are operating according to the instructions. Package includes: 1x Wall Scanner