these are the worst. do not waste your money.  I bought 8 of them a little over a year ago and 4 have broken, 2 of which were replaced by wayfair.  Wayfair only allows 30 day return policy.  They do not even break while being raised or lowered.  you go into a room that you have not been in and boom, the internal string has evidently snapped  and no longer usable, have not been touch by human hands in 6 months.