Features: Simple operation, exquisite design, easy storage and low failure rate. The sensitivity is easy to detect a metal object of size (or even smaller). The sensitivity can be adjusted according to the requirements of the site. There is a low battery voltage indicator (the LED is always on). It is commendable that this model is the most cost-effective in the same style of products. Alarm mode has two alarms: sound and light, vibration. Hand-held and lightweight, easy to use. Low power consumption, beep when metal is detected. Application: This model has become a regular anti-theft vice president for industrial enterprises and electronic digital manufacturing enterprises. It can be used for public security at airports, railway stations, docks, prisons, customs and border defenses, as well as for quality control of medicine, food and other goods. Specification: Working Frequency: 25KHz Sensitivity: A25 cent coin detected 65mm Cast iron tube in 20mm-120mm (diameter) Powered by: 9V x 1 battery (not included) Tuning AuomaticAlarm Mode: Sound & Light Sync AlarmPower Consumption: 220mWPworking Current: Less than 8mWork Temperature: -10°C-50°C Material: Plastic & Metal Dimensions:Handle: 3.5x2 6cm/1.38x10.24inch Coil Diameter: 13.5cm/5.31inch Color: Black Quantity: 1 PcNote: 1. Please allow 0-1cm error due to measurement Manual. Pls make sure you do not mind before bidding.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:1 x Foldable Metal Detectors (With Retail Package)1 x User Manual