Sunny Day is designed for daily urban commuting which is a 10 to 30 minutes ride, it is a pedal-powered with full time electrical power assistant, the battery could be charged either by plug or solar energy. The solar panel is mounted in the front of the bicycle, so whenever there is a sunshine, you can charge the battery. Sunny Day bike integrates the solar panel and the bike with aerodynamically shaped, to make it fashionable bike. Sunny Day bike is light, clean, and foldable.