Batteries: Dry cell - Alkaline 4 x AA. Battery life: 20 hours. Maximum range: 1 ppb to 10,000 ppm. Operating temperature: -20 to 60°C. Storage temperature: -20 to 70°C. Data logging: automatically records readings every second including date and time stamp. Alarm: flashing LED and 90 dBA (10 cm) audible sounder. Dimensions: 340 x 60 x 49 mm. Weight: 1.3 lb.