Source Whoa! First ever unbiased imperfection on the Wii! The Wii sensor bar can't work correctly under sunlight. To make it more clearly, it can't send the signal from the Wiimote to the sensor bar if there's sunlight in the way. Not a problem for me though, i'm playing it in my Basement so sunlight won't be a problem. Might cause a few problems in some households though.