Product Description: CO personal/professional gas monitor is designed to detect and warn the user of hazardous levels of carbon monoxide in a working environment. Product Specifications: Operational Temperature -4 to 104 F (-20 to 40° C) Humidity 15-90% RH (Non-condensing) Power Source 3.6V Lithium Battery Battery Life 2+ Years Size 3.81" x 2.31" x 0.8" (9.67 x 5.87 x 2 cm) Weight 3.6 oz. (105 g) Sensor Specifications Type Resolution / Range CO 1ppm / 0-999 Product Description: CO gas monitor is designed to detect and warn the user of hazardous levels of carbon monoxide in a working environment. Product Features: One Button Operation Audible Alarm Visual Alarm Vibration Alarm STEL and TWA Alarms Alarm Event Memory Easy Field Calibration 2-Year Operation Industries: Oil & Gas Fire Departments Industrial Workers Home Inspectors HVACR Residential Appliance Repair Product Applications: Personal Safety Confined Space Monitoring Hazardous Gas Detection