Advantage: Powerful,easy maintaining, easy operation. Introduction:It could use five kinds of "Smart plug-and-play gas sensor" The battery can be used for more than 28 hours at a time Large-screen LCD display real-time gases Reading Buzzer alarm 103 dB, LED display when alarming (red / yellow) high / low You can use alkaline batteries, or rechargeable nickel and manganese batteries Alkaline batteries can be used for 28 hours (suction pump can work 16 hours continuous use) Nickel manganese batteries can be used for 22 hours (suction pump can work 12 hours of continuous use) Simple three-button operation Optional data collection function Use environment: -40 ° C ~ 50 ° C; 0% to 99% RH. Weight and Size: 5.94 "x 5.2" x 2.8 ", 550g (with pump 650 g)