Turns out, reading the manual in full is handy. If you’re wondering why your Segway Ninebot Kickscooter MAX is beeping constantly, it’s because you have to activate it.
Open the app, connect via Bluetooth and then click the little gear icon. Click “Activate” and then hit yes. It should make one more long beep and shut up after that.
They also limit the speed on the device until you’ve activated it, which makes sense, I guess?