The AF04 is a fan inspired by the natural phenomenon of wind between valleys tends to be much stronger. It is a multifunctional device integrated with air circulator and heater. It can be used as a fan during the summer, a circulator during the spring and fall, and heater during the winter. Through our patented technology, hidden fans inside the frame create airflow and capture air into the square frame, which is 20% more airflow. With less energy use, the AF04 shows great energy efficiency than conventional fans. Its blade-hidden design offers great safety to users, especially to children. The circular body intuitively shows its functionality, which smoothly rotates from 0 to 90 degrees. Touch buttons are located on the right side with icons, which easily indicates each functions.