Handheld Metal Detector MD-3003B1 Handheld Metal Detector MD-3003B1FEATURES1. Adopt cyclic switch to choose sound alarming ... voltage is not enough, no light or no alarm.5. Have leather cover, convenient to carry, light and good appearance, suitable ... security inspection equipment to increase safe efficiency, such as walkthrough metal detector.-Can detect various metals, such as: Copper, Ferrous and ...