Using a 24VAC 10VA transformer which Eufy manufacturer instructions recommends for the E340 is not powerful enough, I had mine hardwired for 8 months with endless notification issues, Eufy did send out a replacement, still the same issues.
I have now purchased a 24VAC 30VA continuous supply transformer, now works flawlessly so beware before you hardwire the doorbell.
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What kind of notification issues did you have?
Once the doorbell pressed, notifications stopped, so really a doorbell, no security. Hope that helps.