WT8801 Combustible Gas Leakage Alarm Detector Compound Gas Monitor Tester DC100‑ Item Type: Combustible Gas Detector Material: Engineering Plastic + Rubber Purpose: Combustible Gas Detection Alarm Detection Gas: A variety of mixed gases Measuring Range: 0-100%LEL Accuracy: ≤ ±5%FS Response Time: (90%) <30 seconds Indication Mode: LCD displays real-time data and system status, LED, sound, and vibration indicate alarm. Storage Conditions: Temperature: -10-55℃; Humidity: <85%RH Operating Conditions: Temperature: -20-50℃; Humidity: <959%RH (non-condensing) Charging Time: 6-8H Standby Time: >8h (Slightly Change According to Working Status) How e: Connect the alarm device through the power cord, press and hold the power button for three seconds to turn it on. The left and right buttons can be used to select left and right. Confirm the function key to determine the selected function. You need to install a calibration cover to cover the calibration port, and fix it on the alarm tester with screws, and then e.