The ET110 CO Detector is an easy-to-use meter that detects and measures concentration levels of carbon monoxide (ppm) and temperature (Fahrenheit/Celsius), making it the perfect choice for HVAC professionals. Features backlit LCD screen, warning indicator light, audible and visual alarms and multiple function buttons. Includes carrying pouch and 4xAAA batteries. Special Features Audible Alert, Auto-Power Off, Visual Notification Display Backlit LCDApplication Carbon Monoxide Detector Overall Height 1.45" (3.7 cm) Batteries 4 x AAA Overall Width 2.16" (5.5 cm) Included Batteries, Pouch Overall Length 7.75" (19.7 cm) Measurement Standard F/C Type Carbon Monoxide Meter Weight 5.10 oz (144.2 g) Style_Name Carbon Monoxide Battery Type Alkaline