How do you know how to prevent a gas accident? - Don't worry, our gas detectors are perfect for protecting your family and ensuring that gas leaks are avoided.OC-840 protable voice type multi gas detector is a safety device that can continuously detect the concentration of leaking gas.Advantage: 1. This gas alarm has a password change system that you can change under the menu list. 2. The O2 alarm LED display supports Chinese and English interface and Chinese and English voice prompts, so that users can quickly understand the product. 3. The gas concentration value is set by the system. Once the gas concentration exceeds the standard, the alarm will turn on the alarm by simultaneously emitting sound, light and vibration.Display Precision: ≤ ± 5% FS Response time: <30s Working environment: -20 ° C ~ 50 ° C, <95% RH (no condensation) Power: DC3.7V (Rechargeable lithium battery, 1800mAh) Protection level: IP65 Sensor life: 2 years Protection level: IP65 Weight: 300g Size: 140mm × 73mm × 32mm (length × width × height) Charging time: 4h-6h Working time: Over 10hours Indication mode: LCD displays real-time data and system status, illumination, vibration and real-time voice recording (Chinese and English) prompts Alarm:Audible-visual-vibration alarm withvoice alarm Explosion-Proof grade:ExibIIBt3GbWidely used in petroleum,chemical industry,environmental protection,metallurgy,refining,gas biochemical medicine,agriculture,fire protection,archaeology and other industries and places that need safety monitoring for toxicity and harfulness,explosion prevention.