The fan comes with a built-in rechargeable lithium battery; it comes partially charged, so it’s ready for you to test. The battery is housed behind the fan and is not removable.
You can change the angle by rotating the fan on its axis up and down or side to side. To start the fan, you press the button behind, then press it up to three times to pick the speed setting. The highest setting is really cooling and quite powerful for a fan of this size.
It is easy to charge with the included USB lead. So far the battery has lasted well, but it also charges quickly too, so it's ready again for use a lot quicker than I thought possible.