Features 1、METAL DETECTION: Handheld metal detector, providing precise metal security inspection, with adjustable sensitivity, convenient and practical. 2、3 COLOR INDICATOR: The metal detector has 3 color indicator, green indicating voltage, yellow indicating low battery, red indicating metal detection alarm. 3、2 ALARM METHODS: The metal scanner has audio signal indicator and vibrator indication alarm mode, meeting the needs of different situations. 4、HANDHELD DESIGN: The metal detector is portable design, easy to carry at any time, powered by a battery (not included) to avoid wiring trouble. 5、APPLICABLE PLACE: Used for security inspection and testing of metal knife, steel ball, coin, etc., suitable for train station, school, dock, factory, etc. Specification Item Type: Handheld Metal Detector Model: GC-101H Material: ABS Frequency: 22KHz Consumption Power: Maximum 270MW Standby Current: <8MA Reset Time: 0.5 Seconds, Automatic Power Supply Battery: 1 x 6F22 9V Battery (not included) Alarm Indication: Yellow LED Indicator: Metal target detected Green LED Flashing: Power on Red LED Flashing: Low voltage indicator Alarm Signal: Sound Mode: Buzzer and Red LED Vibration Mode: Vibration and Red LED Detection Object: Metal (knife, steel ball, coin) Detection Distance: Iron Nail: Approx. 60mm / 2.4in Coin: Approx. 100mm / 3.9in 6 Inch Long Knife: Approx. 170mm / 6.7in Steel Ball: Approx. 100mm / 3.9in Package List 1 x Metal Detector 1 x User Manual