The Casio XJ-M151 has a quite quiet noise level (only 33 decibels) compared to most of the other similar spec multimedia projectors that have been on the market for around the same time as this multimedia projector. 1800:1 contrast ratio data projectors that were released more than two years ago have noise levels of between 31dB and 43dB.
We think you might also be interested in some of the alternative 33dB noise level multimedia projectors currently available including the XJ-M146 (£983.23), or the XJ-M156 (£956.24) both from Casio which has better reviews.
If you would consider a data projector with a louder noise level then you might want to look at the Casio XJ-M251 (£1,145.37) (33dB).
What does "noise level" mean?