Description: When metal is detected, it sends out alarm sound and vibration. The operation is simple, exquisite design, easy to save, low failure rate. Small Size: A small piece of metal detector with a hand strap makes it ultra-portable and convenient. When the battery voltage is insufficient, it will automatically send out a continuous alarm sound, red bright light. Application: Airports, industrial sites, government buildings, schools, hospitals, conferences, nightclubs, sporting events and anywhere you need security. Specifications: Material: Plastic. Size: 350*140*30mm. Color: show as pictures. Battery power: 300 mW. Low voltage indication. Power: 1x9V(6F22) battery (not included). Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1 * md300 metal detector. 1 * User Manual.