The company behind the smart internet connected doorbells has been purchased by Amazon for $1bn. It is reported that the purchase of Ring is Amazon's second-biggest acquisition to date.
The Ring doorbells are to join the internet giant's smart home lineup.
The Alexa smart speaker, created by Amazon already integrates with the Ring product line.
As a result of the acquisition, ADT's shares are down by 7%.
Sir Richard Branson is an investor in Ring.
Amazon has recently launched a similar service which allows the Amazon courier to let your item into your house when you're not home.