A very practical uv water purifier the steripen freedom can be charged using its usb connection mains adaptor or the handy solar charger included compact and lightweight the steripen freedom is easy to use simply place the lamp in water and stir until the led lights become solid green confirming that your water is now drinkable ideal for many situations but particularly for trips into the outdoors and camping the steripen freedom will purify water from a tap a community well or a fresh wa