Multi-Gas Detector Replaceable Battery Yes Product Type Multi-Gas Detector Display Screen Type LCD Includes Probe No Housing Color Phosphorescent Gas Detected Carbon Monoxide Nitrogen Dioxide Communication Protocol Peer to Peer Series ALTAIR 2X Status Indicator LED Sensor Type Catalytic Electrochemical Temperature Code T4 Alarm Setting Adjustable Alarm Volume Level 95 dB @ 1 ft Battery Life 18 mo