Features: 1) Operating frequency: 20kHz2) Weight: 272g (including the battery)3) Size: a) Length: 420mm b) Width: 138mm c) Height: 110mm4) Handle measurement: 30 x 30mm5) Regulate the way: manual6) Indicator: BZ, vibration motor7) LED light proves: LED red warning indicator lamp, LED green insufficient indicator lamp, voltage indicator lamp LED battery of power8) Battery: 9V battery (suitable for working for 40 hours normally)9) Control: circulation switch (On, Off, a sound of light or mode of vibration)10) Uses cycle-switch to switch sound alarm and hidden vibration alarm respectively11) Highly sensitive, detect ferrous and non-ferrous and stainless steelweapons12) Sound and light alarm simultaneously13) Alkaline cell (7V-9V) can work over 40 hours and distance does not change14) Warn automatically when short of voltage15) Simple, convenient to use, easy to adjust16) Detecting distances: a) 1/2 pin: 10mm b) Model 64 pistol: 150mm c) 6" dagger: 150mmd) 8mm (diameter): 40mme) Aluminum & copper sheet: 10mm f) DIP14 IC (integrate circuit): 5mm g) Silver ring (1g): 40mmh) Lead brick (1g): 30mm producing area:China