I bought this for a 4,000 mile, 100 day cycling tour of Europe (March - June). It was probably my best performing and most reliable piece of kit. I was so impressed. My journey took me from England to Calais, through the snow and cold temperatures of Alpine Austria and then on to the sweltering heat of Serbia, Bulgaria and Romania, before finishing in Sweden. It was efficient in charging my tablet, camera, mobile phone and MP3 player. My trip was hard going. The bike needed 2 pit stops, the trailer 3 pit stops. Camera broke, MP3 player was damaged, Bungees snapped around Day 90, tent started to get loose stitches towards the end and pretty much everything I had was exhausted by the finish line BUT... this Solar Charger remains resilient. It was dropped, rained on, snowed on, clogged up with road splash but just wiped cleaned and carried on working. Used every day. Worked every day. Well done Anker.