High Quality Portable Carbon Monoxide Detector With LCD Displayer 1.Power: ... 999PPM;4.LCD Backlight: blue;5.Main Functions: settable alarm point, silence, low voltage warning, malfunction warning, ... outrange warning, density value display;6.Alarm Light: red;7.Circuit Operation: green;8.Fault ... yellow/white16.Weight: 135g LCD Displayer Portable Carbon Monoxide Detector(Co Alarm)