Attributes . Continuous LCD Shows Real-Time Gas Concentrations, Compact and Lightweight Design Makes it Comfortable to Wear, Water Resistant, Simple Automatic Calibrations Procedure, Compataible with BW Microdock II Automatic Test and Calibration Station, Full Function Self-Test Of Sensor, Battery Status, Circuit Integrity and Audible/Visual Alarms On Start Up, Bright Wide-Angled Visual Alarm Bars, Built-In Concussion-Proof Boot . Names