Sell MD-S1 hand held metal detector

MD-S1 hand held metal detector
Power: 9v(6F22)
Working frequency: 22khz
Working voltage: 7v-9v
Sound: Speaker or Earphone (earphone not included)
Lows sensitivity Switch Sensitivity Adjuster
High sensitivity: 15mm at Pin;
45mm at USD 25 Cent
Low sensitivity: Detector only respond to bigger metal