Made in the USA of domestic and imported parts Electronic Circuit: Instead of manual adjustment with a screwdriver, TRANSIT’s sensitivity adjusts itself automatically: Unlike other detectors, when TRANSIT detects metal, it alarms for several seconds, then resets to zero, ready to detect any further metal items Operating Frequency: 95kHz Battery: 9-Volt alkaline or NiMH rechargeable, typically lasting 60 hours or 2, 000 scanning operations Charging Voltage: On models with built-in charger (TRANSIT-3 and -4) specify 120V AC or 240V AC Operating Voltage: between 6.8 and 10V DC Battery Voltage = OK: green LED indicator light Operating Current: 80mA typical Detection: Medium-size handgun from 20cm Large knife from 13cm Razor blade from 7cm Hat pin from 3cm Environment: Temperature range -25° to +55° C Length x Width: 315 x 50mm Weight: 272g (without battery)