First the Magnifier window to effectively clean the sensor is too small and does not easily give access to stylus to clean it ... or it must contort to get there! The stylus itself is not very effective and the removable part is often of no use! The pear really removes the superficial part of the dust without more, but that's normal ... The lamp of the switch has already had a bad contact and would not come on ... it was fixed later by the action of the Holy Spirit ... Despite all this, I still managed to almost completely clean my sensor but I have me back several times ... In short, for the price, this is not an article to be complete although advisor to clean your sensor but do not be too looking at the result!