... designGood sensitivityEasy to handle and use BenefitsMD-300 metal detector is a mini-type hand held metal detector, ... It will gibe an alarm sound and vibration with low voltage power alarm.OperationSwitch ON: a sound ... SafetyThe MD-300 is safe for the people with pacemaker and pregnant women,magnetic floppy, and recording ... piece in a small box, then 20 pcs to a big boxCarton Quantity: 20 pcsCarton Size: ...