Lower your electricity bills and harness the power of nature instead. This New Window Emergency Solar Battery Charger will help you nail this mission. Just attach it to your window, wait for it to absorb the sun's energy before juicing up your gadgets. It takes 13 hours for a full charge. It also looks sleek and modern so hanging it around wouldn't distract the room's decor drastically. It's available in various colors, so pick one which will match your style.
This charger has gained an average rating of 2.9 stars on Amazon. Some users use it on their car windows and others use it as an emergency charger, especially during winter storms. However, a significant number of users were either not patient enough to wait for it to work and have encountered malfunctions on their units.