Recently launched on Kickstarter, the Window Solar Charger was conceived from the idea that everyone should be able to generate their own clean energy. While homeowners have much more control over their power sources, renters and people on the go often have very little options to live a truly sustainable lifestyle.

Related: Meet Solar Cat, a cute and creative take on renewable energy

After years of being frustrated with how hard it is to adapt solar energy in her own NYC apartment, Grouphug’s founder and lead product designer, Krystal Persaud, decided to invent a personal solar-powered charger geared toward those apartment dwellers who want to be more sustainable.

Essentially, the charger is a 13-inch-by-10-inch bamboo frame with four thin solar panels. The charger can be hung in any window to soak up direct sunlight into the battery that is built into the frame.

After approximately eight to 10 hours of sunlight, phones and other small devices can be plugged directly into the frame’s USB port. Devices can be charged day or night, and on average, a full battery can charge iPhones two times and Android phones one to one-and-a-half times.

+ Grouphug

+ Window Solar Charger Kickstarter

Images via Grouphug