If they figured out the availability of devices when setting up different regions (despite the fact that devices are actively supplied in 2022, but you still need to set China, as for the same repeater), it would be much more convenient. Specifically for this filter, they should have added a simple power control knob so they don't have to wait for an app on their phone to open. A simpler solution: the second custom power mode, which, almost sure, can be done even purely programmatically by ating the firmware (the filter can ate itself, just press the button in the application). Because of these two inconveniences, I put 4 and 5, but as a filter it works pretty well.
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