Single Gas Hydrogen Monitor Replaceable Battery No Product Type Single-Gas Detector Display Screen Type LCD Includes Probe Yes Housing Color Black Gas Detected Hydrogen Communication Protocol Bluetooth Series NXS Sub-Brand Nextteq Battery Size 1/2 AA Operating Humidity - Maximum 95 Percent Status Indicator LED Rechargeable Battery No Operating Humidity - Minimum 95 Percent Sensor Type Electrochemical Temperature Code T4 Alarm Setting High 100 ppm Low 50 ppm