A number of firms have shown off smart doorbell products at CES, aimed at the growing smart home security market.
Amazon-owned Ring’s Video Door Cam can be attached via an existing peephole in a door. The firm told the BBC it was aimed at renters who may not be allowed to drill holes in a door.
It also has a sensor which notifies you if someone knocks on the door instead of ringing the bell.
French firm Netatmo is offering free video storage with its new product.
Other firms tend to charge a subscription to store video captured by a doorbell device.
The Netatmo Smart Video Doorbell is fitted with a microSD slot to store video in an encrypted form, but it can also be transferred to a Dropbox account or another server.
It works with Apple’s HomeKit system, as well as Android and web applications. However, unlike Ring’s device, it requires wiring.
California firm Maximus unveiled a doorbell which contains two cameras to provide a broader field of vision.
Smart smoke-detector maker First Alert announced its first smart doorbell system, the One Link Bell, which it said would also work with both Amazon Echo and Google Assistant smart speakers.