Frequency Range: 50 to 500 HzTest Voltage Range: 90-1000V ACSafety Rating : CAT II 1000vPowered By: 2 x AAA Batteries (Not included)A perfect tool kit for home and electric industry usesIdeal design for testing power cables、 circuit breakers、 wall sockets、 junction boxes、 fuses、 etcJust press the button、 white LED light can be always on when there is absence of voltage"Beep" sound and red flashing LED would indicate the presence of voltageTotally insulated、 no exposed metal or conductive partsLong life and low power consumptionCompact、 safety、 & easy to carrySpecifications:Material: ABS Plastic