It says that this machine has two frequencies: 33 and 40Khz. However, there is no switch visible to choose between those frequencies. Also, the lettering on the back (in the photo) says only 40Khz. Also under ' built to last' it says 'features ... practical handles on both sides'. In the pictures those are not there. I think part of the information on this page is incorrect, and may be copied from a different model.
