There is no specific information on whether the Winbot W1 Pro can be used in direct sunlight. However, it is important that the window surface is dry and free of dirt to ensure optimal cleaning. Direct sunlight could affect the effectiveness of cleaning as it could heat up the surface and cause the cleaning fluid to evaporate more quickly. If necessary, it is recommended to use the robot in a shaded area or at a time when the sunlight is not so strong.