About hand held metal detector Symptom: after ON of 1-2 seconds had alarm or keep to vibration

Reason Analysis : this appears of this hand held metal detector was due to high sensitivity and low power. Some users use after a period of time, didn't notice the battery voltage is less than the operating voltage, tend to think: probe more than deemed failures, and let the repair. Exclude ways: 1, emits alarm sensitivity of SI Cho arrived, up to not alarm. 2, the adjustment cannot be ruled out, replace or charge the battery. Note: low profile low sensitivity adjustment does not affect the detection accuracy.