Smart doorbell maker Ring is one of those rare Internet of Things companies that actually creates useful products. Its latest is the $250 Video Doorbell Pro, an updated version of its original $199 Video Doorbell. The basic premise is the same: the doorbells connect to your Wi-Fi, and when someone rings it you can answer from your phone with a video call. It's handy if you've got a delivery you don't want to miss, or if you work from home and don't fancy getting up from your desk every time someone comes calling.

Like the original Video Doorbell, the Pro has a night vision mode and the option of saving up to six months of video to the cloud (for a fee of $3 a month or $30 a year). The new $250 version, though, is slimmer and has a better resolution camera than the original (1080p video compared to 720p) and also has new configurable motion-detection zones, allowing users to draw (using the connected app) exactly which parts of the doorbell's view should be closely watched:

Drawing out motion-sensor zones on the Video Doorbell Pro. (Image credit: Ring)

If you're in need of a smart doorbell, then the Pro is a good option to consider, and investors seem to think the same too. VentureBeat reports that Ring has raised an additional $61.2 million in a series C funding round, with the company planning to now expand its product lineup and expand internationally.