... -weight(500g) Wide range, Velocities( 0.01 ~ +/- 32 m/s) Ni-MH Battery support at least 10 hours continuous operation Maximum temperature 160 ... :Fiberglass... Etc90% RH or LessLiner Material:Built-in Battery:Tar Epoxy, Rubber, Mortar, Polypropylene,Ni-MH BatteryPolystyrol, Polystyrene, Polyester, Ebonite,Operation Time:Polyethylene ...