Conforms to the National and European guidelines, Cat. II, Class BSpecifications: Operating Conditions: 14 to 120°F (-10 to 50°C); 95% RH or lower Power Supply: 2 x 1.5V "AA" batteries Battery Life: 4 hours of continuous use Dimensions: 6.45 x 0.82" (164 x 21mm) Weight: 0.88 oz (25g)