Remote control button can go on your wrist, shoulder, or paddle if you're on a SUP. Using the mobile app, you can adjust the duration and power depending on your needs.
There are 3 modes that you can activate:
Mode 1: quickly pressing the button activates the short boost (by default 8 sec) - the one you'd use to catch a wave.
Mode 2: pressing and holding the button for a few seconds activates the long boost (by default 20 sec) - you'd use it for long paddling sessions and distant lineups.
To stop the Boost Surfing Fin just quickly press the button one more time.
Mode 3: continuous mode - it's meant for cruising on a SUP but you can always activate it in the app if necessary, then it's a simple on/off switch.