1.It Makes It Easy to Locate and Track Buried and Hidden Wires and Other Hidden Lines.Applicable Only to Electrical Cables and Not to Sprinklers Or Irrigation Faucets2.It Is Easy to Find The Fence for Pets, Metal Wire, Metal Tubes, Electric Wires and So On. Determining A Hold On A Specific Drill Position Prior to Drilling3.Tracing Is Performed At A Depth Of 1,000 Feet.Source: 9V Alkaline Cell.4.Warning: Do Not Use The Circuit Of Load to Prevent Damage to The Tester The Device Is Only Used to Locate Unpowered Wires.5.Warning: Only Applies to Single-Core Or Double-Core Wires, Not Wires Multi-Core and Beam. Not Including 9V Batteries. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store