YABER Buffalo Pro U7 pioneered keystone correction. It's the first projector with 6D automatic keystone technology on the market. Which means that after turning on the power to set the rectangular standard image, if the projector undergoes any movement or collision, Buffalo Pro U7 will automatically correct it and return to the standard image within 1s. Except the Auto 6D keystone correction, Pro Buffalo Pro U7 also retains the 4-point & 4D keystone correction function.