The Streetwise Hand-held Metal Detector is sensitive and lightweight. It is designed for use by law-enforcement officers and security personnel to quickly detect even the smallest metal weapons. It is sensitive enough to detect a handgun or knife from six inches away. With its large detection area, you can do a fast, yet thorough, scan. The lightweight design and comfortable handle makes it easy to use for long periods of time. With its adjustable sensitivity this metal detector is ideal for use in airports, schools, prisons, sporting events, nightclubs, etc. It has both audible and vibration alerts so it can be used in situations with loud noise such as concerts or nightclubs. It is powered by either a standard or rechargeable 9 volt battery (recharger not included) and features a low battery power indicator.