The Solar Boiler is your own personal water heater, and is powered using ONLY the sun. There are no batteries, cords, or electricity needed. You can make coffee, tea, soup, use with dehydrated foods and much more with your Solar Boiler. You can even use your Solar Boiler to make hot water for hygienic purposes, or to supply yourself or you loved ones with clean drinking water by boiling it.* Made from tough, weather-resistant ABS plastic and tempered glass, the Solar Boiler boils water in about 30-45 minutes when in direct sun.Its ingenious design consists of an inner glass tube and parabolic mirrors that absorb the sun’s heat to boil the liquid inside. It can hold 16.9 oz. of water, and is completely portable. ✅ Operates using two (2) parabolic mirrors that grab sunlight and focus it on glass tube✅ Ultra-compact: parabolic mirrors fold for travel✅ Constructed from tough, ABS plastic & shatter-resistant, tempered glass✅ Boils water in approx. 45 minutes✅ Holds 16.9 fluid ounces✅ Equipped with a ventilated cap to avoid over boils✅ Dimensions: 16.25" H x 4.1" D / Weight: 2.65 lbs. 1. Fill with water as required , ensure a space of approximately 5cm (2inches ) below the rim and do not overfill.2. Open panels outward and place handle into notches on panels3. Place in a sunny space ,shadow directly behind and Boom, let the Solar Boiler work its magic in the great outdoors. The ventilated cap is specially designed to prevent dangerous over-boils and with a square base, this gives four points of contact on almost any even surface. That means less worry for YOU about tips and spills.