How to use AUDELN Massager: Press the power button to start up for 3 seconds.Tap the "+" button to change vibration modes. The first mode has weak, middle and high levels, while the other 20 modes are different, each mode of the handheld massager has its own different flashing light Press and hold the Power button for 3 seconds to switch off the massager. Plug USB cable into a USB adapter to charge your massager.Plug in the massager into a 5V USB socket i.e. PC / Laptop usb or wall charger.