... RS6201 series include the following three types of Optical Power Meter, which divided by different measuring range.TypeRS6201ARS6201BRS6201CDetectorSiliconInGaAsWavelengths650 ... ,780,850,980,1060nm850,980,1310,1490,1550nmOptical Power Range+3~-70dBm or+10~-70dBm(Optional)+26 ... (Can be Expanded)ConnectorFC Versatile Connector(Optional for SC, ST)InterfaceRS232(Optional)Power Supply8.4V Battery or DC12V ...