CT-900 This product is widely used in airports, industrial zones, government buildings, schools, hospitals, meeting places, sports, etc. necessary to carry out safety inspection of all places. Whenever the detected metals, the detector will be issued to the sound reproducing apparatus. Sensitivity sufficient to detect the 25 cents coins. Larger objects measured tone long hair; measured objects smaller hair. In addition, can also be used rechargeable nickel-based batteries as a power supply separated. And charge detector of the machine. (Should be matching dedicated charger) 

Product features: 
1: Red LED display: Press when the light-emitting instructions; 
2: drop-min button: when pressed, enables the detection of metal detector sensitivity by about 50%. Therefore, may contain a large number of steel bars 
      Floor near the detection, or used only to detect large metal objects. 
3: the headphone jack: the results in the detection of a user, I only need to know the circumstances that can be used to insert the headphone jack placement. 

Technical specifications: 
Sensitivity: Φ2.0mm Ball 
Power Supply: 9 volt battery (6F22ND) 
Operating frequency: 13KHz 
Power consumption: 270mW 
Current job: less than 60mA 
Operating temperature: -10 °