Pro kit not installed

My installer left out the power pro kit, my doorbell is working ok but is this a required piece?

Hi @Moje5ring. The Pro Power Kit is required to be installed with your Doorbell Pro. If it’s installed without it, this could cause damage to your Doorbell. I’d suggest reaching out to our support team so they can take a look and make sure your Doorbell is installed and working properly. Please give our support team a call at one of the numbers available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. If you are outside of the US, please read our response to COVID-19 here to see how to contact support.