Portable 4 in 1 LCD Alarm Co Hs o EX Gas Siren Leakage Voice Detector Security Monitor Item Type: Gas alarm detector Condition: Color: As pictures shown Shell Material: High strength engineering plastics Protection Function: Dustproof, waterproof, explosion proof Accuracy: ≤±5%FS Response Time: T<30s Indication Mode: LCD displays real-time data and system status, lighting, vibration and live voice recording prompts Working Temperature: -20 ° C -50 ° C Humidity: <95% RH (no condensation) Power: DC3.7V 1800mAh (built-in rechargeable lithium battery) Explosion Protection: ExibIIBT3Gb Battery Charging: 4h-6h Working Time: More than 10 hours in full power status Sensor Lifespan: 2 years Protection Level: Ip65 Size: Approx.135x70x30mm/5.3x2.8x1.2in Gas Sampling Pump Working Principle: Diaphragm self-priming Working Pressure: -35Kpa Battery Charging: 4h-6h Working Time: Lasts for 8 hours in full power Working Temperature: -10-60℃ Humidity: ≤95% RH Gas Type Range  Low Alarm Point High Alarm Point Resolution EX (0-100)%LEL 20%LEL 50%LEL  1%LEL H₂S (0-100) ppm 10ppm  35ppm  1ppm CO (0-1000) ppm 50ppm 150ppm 1ppm O₂ (0-30)%vol 19.5%vol 23.5%vol 0.1%Vol