The PRO-SCAN meets the exacting requirements of the security industry and offers high performance and high sensitivity. This unit is typically used to perform body searches for metal objects in airports, at border crossings and in any situation where speed and accuracy are important. This unit requires one 9 volt alkaline or rechargeable battery. Emits an audio alert and features a red light to alert you to the presence of metal. Adjustable sensitivity for a variety of situations.