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The bottom button turns the toy off and on (long hold) and cycles through five vibration patterns (press). The upper buttons move the intensity up and down through five levels. According to the manufacturer, the Aer can fully charge in two hours and can operate at the highest setting for up to one and a half hours on a full charge. In our testing, we were able to achieve a full charge from a drained battery in only an hour and 16 minutes—and the toy was still going strong after we left it on at maximum speed for two hours. You can purchase replacement charger