Multi-Gas Detector Product Type Multi-Gas Detector Display Screen Type Monochrome Housing Color Gray Gas Detected Carbon Monoxide Hydrogen Sulfide Oxygen Communication Protocol Wireless Series QRAE 3 Sub-Brand RAE Systems Operating Humidity - Maximum 95 Percent Status Indicator LED Rechargeable Battery Yes Resistance Properties Dust Resistant Water Resistant Operating Humidity - Minimum 0 Percent Alarm Volume Level 95 dB Battery Life 14 hr