Task: Question Answering
Input (English): I am selling 4 of our old BenQ 6100 series projectors that we used in our business . The projectors are in great working condition however we had too much ambient light and had to upgrade to some projectors that were brighter . These however will work well in a room that has little to no outside light . 
Question: Why is the writer selling 4 projectors ?
Output (English): Because they are not being used anymore .