FeaturesHigh sensitivity Easy and simple to operate Detection distance keep steady when 9V battery is used up to 7V Save power Alkaline battery can work over 45 hours Sound alarms when turn on or turn off device Detection Distance1 Iron nail 30 60mm2 US 25 cent 40 50mm3 Item Size 540 x 165 x 165mm 840 x 165 x 165mm stretch Installing battery1 Press thumb along the direction of arrowhead mark to open the battery lid 2 Put 1 9V Type 6F22 battery into the compartment matching the positive and negative mark 3 Closing battery lid How to use 1 To turn the unit on by pushing the ON OFF switch until it clicks on and the green LED is lit The detector is now operational Check battery if no audio alarm or sound constantly 2 Holding the unit with the search coil face towards the surface sweep backwards and forwards continuously at a height of 10 30mm above the area to be scanned 3 The presence of metal will be indicated by the audio warning tone and the red light coming on 4 The length of inner stem can be adjusted automatically Packge includes 1x Metal detector battery is not included Details pictures