This leads up to the major potential con. Had plastic sticks. The footbed (where you actually place your foot) is covered in fairly thin fabric, and it will rip after a few months of sustained use. por favo busco como loco la ranura SD, pues sino la trae este elefono es inutil para lo que cuesta. However i was unable to store under my bed. Would certainly buy another pair. The final product is slightly stronger than I expected. At first bought size smaller bc thought they run large( even though it said that they are true to size) but had to exchange for an actual size. The range is about 30-40 feet, which is perfectly fine for my use inside the apartment. My feet have been in Birks when not in boots (retired Army) since 1992.