Fixed emissivity (0.95), operates from a standard 9 Volt battery (included), one Year Warranty. Specifications: -26F to 32F (-32C to 0C) +/-5F, 32F to 77F (OC to 25C) +/-3F, 77F to 572F (25C to 300c) +/-4F or 2 percent (whichever is greater) accuracy; 12:1 distance to spot size ratio; 1 percent of reading or 2F (whichever is greater) repeatability; 500ms for 95 percent response response time; 8-14um spectral response; 0.95 (fixed) emissivity; 32F to 104F (OC to 60C) ambient operating range; 0 to 95 percent RH non-condensing up to 86F (30C) relative humidity; -4F T0 140F (-20C to 60C) without battery storage temperature; standard 9V alkaline battery; 12 hours with laser operating battery life; 5.75" x 4" x 1.5" dimensions.