Features:1.High sensitivity. Detects a pin within 30mm—60mm.2.Conveniently and simply to operate. Easily to adjust.3.When battery voltage drop from 9V to 7V, the detecting distance remain unchanged.4.Energy smart: it can work 40 hours continuously.5.Except the light alarm, the audible alarm and the vibratory alarm can be chosen.6.When the battery nearly dies, the audible alarm or vibratory alarm should be a warning.7.Turn on (off) the detector, it will give you an audible alarm or a vibratory alarm.8.There are also two sensitivities, high and low, to select.9.Rechargeable:charge it about 4-6 hours after the battery die10.Self-checking: it self-checks when it starts
11.Using ABS, durable to detected. OPERATION:The Mini MD-3003B1 operates on one 9 Volt standard or rechargeable battery.  To install the battery,slide off the battery cover and place 
the battery into its compartment while machine the +/- symbols.l.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 although an increase in ensitivity adjuster until the red LED is lit and a constant audio tune is heard,Turn the sensitivity adjuster (anti-clock wise )until the red LED just goes out and the tone fades, The detector is now tuned for optimum sensitivity and depth range.

2.Holding the unit with the detection face toward the surface, sweep backward and forward 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,if the detector is held still over a metal object the detection signal will automatically reduce, therefore it is important that the unit is continually scanning the surface when is use.