You want a smart video doorbell and chime that actually lasts five years instead of dying after one software update. Buying the right setup means you only pay for installation once.
Watch the release cycle right now because autumn shopping deals usually hit right when brands drop new versions. That means last year's model gets heavily discounted while keeping almost all the same features.
Remember that the 18-month window is a hard deadline, not free money. If you still carry a balance when the clock runs out, interest kicks in on the remaining amount.