PYLE PTV17 Voltage Detector with Led & Sound Alert, 90V-1,000V AC, Ip54 & Iex1010 Rated Led & Sound Alert 6 Hours Continuous Use Dustproof & Splash proof (ip54) Meets IP54 and IEC1010 standards - LED and sound Alert Test voltage range: 90V ~ 1000V AC Never test above 1000V AC 2 x AAA battery powered (not included) 6 hours continuous use