Video doorbell without existing doorbell

I’m trying to install the video doorbell and our home doesn’t have an existing doorbell. I assumed the SimpliSafe doorbell was similar to ring, blink and other doorbells that use a battery. Is there a way to make the SimpliSafe doorbell work with a battery or do I need to get an electrician out to wire things up? We use SimpliSafe for all of our home security so I’d like to keep the doorbell on the same system.