Press the power button and it works right away. It is forward, reverse. Antenna shape can be 5 steps. 1. About 2. About + Heat 3. Steel 4. River + Heat 5. River The wave is speed adjustable in two stages. Total reviews. It took 18 days of delivery. The back of the neck massage is not cool. If you pull on the string tight, your neck will be a pall. There is no difference in the cool. The heating function is useful. It's more cool on the leg side than on the neck. Don't expect too much!