Features: The hand-held metal detector of high precision, simple operation, equipped with leather, easy to carry Commonly known as plate detector, scanning the area is large, to prevent the omission When the voltage is not enough, the indicator light does not light or alarm, vibration alarm sound and light and double prompt functions, in particular demand occasions can switch by the automatic reset switch, thereby the exclusion of small items Users according to the security level can flexibly adjust the sensitivity, wide range of application areas: Police / security / court / prison / gymnasium and the need to prevent gun / tool place area Factory anti-theft: Chemical Factory / plant / factory / hardware factory / plastic products factory needs anti-theft places. Educational system: application for places various examination, prevent some tools into the examination room (mobile phone / electronic dictionary /MP3/MP4/U disk, etc.) Specifications: Power supply: 6F22ND 9V battery Alarm mode: sound (vibration) optical synchronous alarm Color: Black Product dimensions: 41*8.5*4.5cm(L*W*H) Package includes: 1 * M301 portable high-precision metal detectors 1 * 6F22ND 9V battery