Modern AC Voltage Detector UT11B* CATIV 600V* AC Voltage 50-600V* Completely safe* Indicating by led diod and Buzzer (cancelable)SPECIFICATION:AC Voltage 50-600VFrequency 50/60HzFUNCTIONS:Beeper (cancelable)Led diodAuto Power OffLow Battery IndicationNCV Detection - Autosense