Fanbrella is a well made fan that slides up the pole of a patio umbella. To install it, just remove the umbrella pole from its base, then slide fanbrella right up the pole to the top, adjust and tighten the grip well onto the pole. Not too high, not too low, just right to where it wont hit any part of the umbrella when it starts spinning. Then just reattach the base and enjoy the refreshing breeze! The travel version of Fanbrella is powered by standard batteries, no special battery required.