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Model: MD3003B1 ( Hand held metal detector ) Typical uses will include body search for offensive weapons in crowd control,airport and border security, checking parcels and letters for metal objects. Characteristics 1.)There is a Leathery cover outfits to the metal detector which makes the metal detector be convenient to take. 2.)There is a on-off which can switch the metal detector from sound alarm to light alarm, or from light alarm to sound alarm. It fits to work in different environments. 3.)It can be recharged. It needs 4-6 hours for charging. (the charger and rechargeable battery are ordered additional) 4.)The alarm terms is sound and light alarm simultaneously, or vibration and light alarm simultaneously. You can choose the operate terms optionally. 5.)When the low sensitivity on-off is pressed, the metal detector will only alarm when it finds big metal object (before you finish the low sensitivity detecting, don’t loose the on-off).