... ARM920T, strong image processing, high performance and reliabilityMiaxis SM-621 optical sensor, scratch-resistant, durable, blue background lightMiaxis high capacity fingerprint algorithm ... for all kinds of complicated time attendance managementSpecifications ItemDescriptionSensorSM-621 optical fingerprint sensorScan area16mm×19mmResolution500DPIIdentification methodFingerprint 1:1,1:N,passwordFRR ...