... temperature-5 celcius degree to 38 celcius degreeOperation humidity5%-93%Power source4XAAA BatteriesMaterialABS & PMMAUnit size85x85x50mmunit weight73gColrblack,white,silver,pink,blue ... to use.Impediment analysisIf the light can't work when power on ,please check below :A.check if the battery ... steel-gate,wall and ceiling wall even any places in car. 8.fixed in walkway,corridor,stairs,basement.no need ...