The IMOU chime connects to the doorbell via 2.4GHz Wi-Fi, and also acts as a Wi-Fi extender as well as offering indoor storage of the SD card, which helps to protect the recording.

Read more: Quirky automatic piano has only four keys that move every time you play a note The first electric doorbell was invented in 1831 by the first secretary of the Smithsonian Institution, Joseph ...

To get started, plug the chime into any electrical socket at home and hardwire the video doorbell to your existing wires outside. The 5MP camera picks up 180-degree-wide footage and streams it to ...

The Ring Video Doorbell Wired is an affordable smart doorbell that works with lots of third-party devices, but it won't work with your existing chime and you have to pay to see recorded video.

Best for looking sharp: Netatmo Smart Video Doorbell - £114.38, Amazon Best for easy installation: XTU Wireless WiFi Video Doorbell Camera with Chime - £49.99, Amazon ...