it can be recharged .It needs 4-6 hours fot charging (standard 9V battery , the charger and rechargeable battery are ordered additional )
The alrms terms is sound and light alarm simultaneously.You can choose the operate terms optionally
When the low senstiivity on-off is pressed , the metal detector will only alarm when is finds big metal object Li bettery , USB change cable (for option)
Battery saving function:Automatically power OFF after one minute if no use (for option)
Security Detectintg - Prevent taking contraband , such as - Knife , gun and so on
Factory - Prevent the loss of valued objects
Education area:Prevent taking cheat -tool , such as :telephone , electronic dictionary , and so on.