I ordered the OhmKat Video Doorbell Power Supply - for my SimpliSafe Pro Smart Wi-Fi Video Doorbell along with the Doorbell chime after seeing reviews on Amazon and YouTube. Let me tell you that this was the best decision I made. Not only was the installation painless, the addition of the doorbell chime was a cinch since it just needs a receiver and the transmitter, which incidentally seamlessly plugs into the doorbell supply. If you need more clarity, check out their YouTube channel on how easily they installed it. I didn't need to deal with a separate mechanical chime installation which was an obvious plus. Don't think twice, just buy this if you have simplisafe and you won't regret it.