Combustible Gas Leak Detector. Features Detection range 50 to 10,000 ppm* *based on Methane . Two levels of detection High 50 to 1000 ppm and Low 50 to 10,000 ppm . Five red LED's visual and 85db audible alerts that increase with gas concentration. Automatic zero-point calibration at power-up. 18 inch flexible gooseneck expands sensor's reach; clips onto device for storage. Over-molded body for comfortable grip. Auto power-off after 10 minutes of non-usage conserves battery life. Includes detector, 4xAAA batteries, instruction manual and storage pouch. Specifications Special Features Audible Alert, Auto-Power Off, Visual Notification. Overall Length 28-5/16 inches 719. 1mm . Overall Height 2-3/4 inches 69. 9mm . Overall Width 1-25/32 inches 45. 2mm . Batteries 4 x AAA. Display Digital Included Batteries, Carrying Pouch. Weight w/Batteries 15oz 425g . Weight 13oz 380g . Combustible Gas Leak Detector. Features Detection range 50 to 10,000 ppm* *based on Methane . Tw o levels of detection High 50 to 1000 ppm and Low 50 to 10,000 ppm . Five red LED's visual a nd 85db audible alerts that increase with gas concentration. Automatic zero-point calibration at pow