Feature: 1. Safe and reliable, using high‑quality gas sensors, accurate measurement results and stable performance. 2. The high‑strength shell is made of engineering plastics and composite non‑slip rubber, dustproof, explosion‑proof, and smooth to the touch. 3. Multiple combustible gas detection compound gas monitor, suitable for a variety of use environments. 4. LCD can display real‑time data and system status, LED, sound, vibration indicator alarm. 5. Built‑in 1800mAh lithium battery, long battery life, quick response, convenient and quick gas detection. Specification: Item Type: Combustible Gas Detector Material: Engineering Plastic + Rubber Purpose: Gas Detection of Combustible + CO + H2S + Oxygen Working Voltage: DC 3.7V (Built-in Lithium Battery Capacity 1800Mah) Accuracy: ≤±5%FS Response Time (90%): <30 seconds. Indication Mode: LCD display real-time data and system status, LED, sound, vibration indicating alarm Storage Conditions: Temperature: -10-55°C; Humidity: <85%RH Operating Conditions: Temperature: -20-50°C; Humidity: <95%RH, Non-Condensing Charging Time: 6-8H Standby time: >8h (with Slight Changes in Working Status) How to Use: Connect the power supply and press and hold the power button to turn on, the function of the power button: long press the on/off button, short press to return; left button: forward, up, decrease and other functions; right button: backward, down, increase and other functions; confirm Button: Confirm function. . Package List: 1 x Detector1 x Tool Box1 x Hose 1 x Calibration Cover1 x Metal Nail1 x Charging Cable1 x Charging Head 1 x Instructions