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Description:Power: one 9v alkaline batteryoperating frequency:50khz+-10%(sine wave)sensitivity:>=5cmindication:audio alert and led (red)alert.audio tone changes as the metal size changessilent operation: connect the earphones to the detector for silent operationblink: when the unit is working properly, the blink indicator flashesheadpnone jack: 1/8"low sensitivity: to lower the sensitivity.at this time the sensitivity is > 2 cmlow battery indicationnw: 350gunit size: 440 67 36mmgb dimension: 430 82 51mm