Feature Detect ferrous and non-ferrous metal Light weight and portable design Good sensitivity Easy to handle and use. Benefits The Gp-3003b1 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 needs to be detected Indicators Flashing green led-- power on Flashing yellow led- low battery Flashing red led -alarm Specification Dimension: 415mm(l)x65mm(w)x)40mm(h) Weight: 409g Charger voltage: 9v for ac; 10v for dc It has alarm and audio/light-auto switch functions Battery Standard 9v Standard 7.2v nickel metal hydride (ni-mh) Detection distance Pin 30-60mm; 64 model handgun 150mm; 6 inch long knife 160mm; Diameter 20mm; Steel ball 90mm. Work environmental Operating temperatures:-35ípf(-37íµ) to 158ípf(70íµ) Humidity: to 95% no condensing Safety The gp3003b1 is safe for the people with pacemaker and pregnant women, magnetic floppy, and recording tapes. The magnetic field strength of the gp3003b1 can meet for the emc radiation stardand. Warranty 12 months for the electronic component . 1 piece in a small box, then 25 pcs to a big box Carton quantity: 25 pcs Carton size: 53x45x27 cm Grouss weight: 15 kg.