... and composition LCD real-time display;• Rechargeable lithium battery (continuous working period can be 16~18 ... Alarm Typelow & high alarm, sensor alarm, battery low alarm, prompt tone, automatic shutdown alarmDisplayAlphanumeric ... calibration ;Automatic measurement range calibration.Power SupplyRechargeable lithium batteryWeight211gDimensions100mm*60mm*33mm Gas Parameter ListGasRangeAlarm ThresholdLow ...