This professional 4 in 1 gas detector is designed to detect CO, H?S, O? and LIE. It can continuously monitor the gas concentration of CO, H?S, O? and LEL in the surrounding environment, once the gas concentration reaches the alarm level, the alarm will sound, light up and vibrate. CO, H?S, O? gas tester and high precision portable LIE with compact size and light weight, very easy to carry and use. ? Specifications: Material: ABS Color: Black, Orange Plug: EU, US Detection gas: Carbon Monoxide (CO), Hydrogen sulfide (H?S ), Oxygen (O?), Combustible gas (LEL) Accuracy?: 5?%FS Response time?: T&lt;30s Display?: LCD display of real-time data and system station Alarm?: Audible-visual-vibration alarm with voice alarm Working temperature: -20 -50, Accuracy: 5?% FS Dimension: 140?mm x 73?mm x 32?mm Weight: 217?g < p>Package size?: 23*20.5*10.5cm/9.05*8.07*4.13in Package weight?: 721g ? Note: Item color may show visual aberration due to different shooting and monitor displays. ? < p>Packing List: 1* 4 in 1 Gas Detector 1* USB Cable 1* Adapter 1* Storage Box /&gt; 1* Standard Hood 1* User Manual