solar water heater:Outdoors, Mountaineering ,Fishing, Travels, Geology inspect, Field work. solar water heaterFunction: Heat waterSuitable for use: Outdoors, Mountaineering ,Fishing, Travels, Geology inspect, Field workMethod of ... , Body diameter:8cmCup weight: 0.9kgAttention: Water must be added first before us, Do not use it dry in the sunshine. The ...