... , government buildings, schools, hospitals, etc. hand-held metal detector MD-200 Features:1. Operating frequency:2. Weight: 272g3. ... x 30mm5. Regulate the way: manual6. Indicator: BZ, vibration motor7. LED light proves: LED red warning indicator lamp, ... Off, a sound of light or mode of vibration)10.Uses cycle-switch to switch sound alarm and ... (1g): 30mm High Sensitivity Hand-held Metal Detector MD-200