Single-Gas Detector Replaceable Battery No Product Type Single-Gas Detector Display Screen Type LCD Includes Probe No Housing Color Black Gas Detected Oxygen Communication Protocol Peer to Peer Series ALTAIR Operating Humidity - Maximum 95 Percent Status Indicator LED Resistance Properties Dust Resistant Water Resistant Operating Humidity - Minimum 10 Percent Temperature Code T4 Alarm Setting High 23 Percent vol Low 19.5 Percent vol Alarm Volume Level 95 dB @ 11.8 in