... :Outdoors, Mountaineering ,Fishing, Travels, Geology inspect, Field work. sun cell productFunction: Heat waterSuitable for use: Outdoors, Mountaineering ,Fishing, Travels, ... put the cup in the sunshine, bottom towards to the sun, makes the body around 45 degree bias.Max capacity: 500mlBody ... must be added first before us, Do not use it dry in the sunshine. The products not suitable for cold light ...