Hauv kev tsim kho kev lag luam, kev sib txuas lus zoo yog qhov tseem ceeb.Ib qho tseem ceeb ntawm qhov system no yog qhovxov tooj weatherproofthiab xov tooj xwm ceev.Lub xov tooj zoo no yog tsim los tiv thaiv huab cua hnyav, ua kom muaj kev sib txuas lus tsis muaj kev cuam tshuam txawm tias nag hnyav, daus los yog kub heev, thiab ua kom cov neeg ua haujlwm tsim kev sib txuas lus raws sijhawm thaum muaj xwm txheej ceev.