Single-Gas Detector Replaceable Battery Yes Product Type Single-Gas Detector Display Screen Type LCD Includes Probe No Housing Color Black Gas Detected Phosphine Communication Protocol Peer to Peer Series ALTAIR Pro Battery Size 2CR Operating Humidity - Maximum 95 Percent Status Indicator LED Resistance Properties Dust Resistant Impact Resistant Water Resistant Operating Humidity - Minimum 10 Percent Temperature Code T4 Alarm Setting High 1 ppm Low 0.3 ppm