I purchased the projector fully aware that it is a 'budget' machine and having read the considerably mixed reviews for the product's performance (I wasn't therefore expecting brilliance!). And to be fair, the first two times I used the machine with a MAC, it performed well - projecting clearly from a distance of 2-3 meters.
However when I tried to use the projector a third time using a PC, the power appeared to have gone - the light was very faint and I had to position it very close to the wall I was projecting on (less than 1 meter) in order for the image to be viewed. The projection was increasingly 'fuzzy' around the edges - eventually after a couple of hours, it completely faded away. I have now purchased a more high-spec projector.
I returned the product and was given a full refund from Amazon.