The Pro-Scan is a high performance hand-held metal detector designed to meet the exact requirements of the security industry. Typical uses will include body search for offensive weapons in crowd control, airport and border security, checking parcels and letters for metal objects and anywhere that hidden metal nees to be detected. The Pro-Scan operates on one 9 V standard or rechargeable battery. The presence of metal will be indicated by an audio warning tone and a red light coming on. A pen knife will be detected at 4" on low sensitivity and 6" on optimum sensitivity. A razor blade will be detected at 2" on low sensitivity and 4" on optimum sensitivity. Comes with a FREE holster.