@Haloweenhamster it will require 16V-24V (see link below)
I agree, the unusable chime is odd, since the Nest Hello can use your existing chime. The separate chime better be reliable! I also have 2 Google Home Minis, and an Amazon Echo Dot, I hope Eufy can tap into their APIs to also ring those.
Keep in mind though, that this is 2K, so maybe it needs all the power. Perhaps Eufy will release a Slim Doorbell that will be easier to install for more houses