One in six adults in the United States own voice-activated smart speakers, according to research.

The Smart Audio Report, which is based on data from NPR and Edison Research, said Monday that around 39 million U.S. adults own a smart speaker, and that the adoption rate of such speakers over the last three years is now outpacing that of smartphones and tablets.

According to the study, which surveyed 1,816 Americans aged 18 and above, 11 percent own an Amazon Alexa device while 4 percent have a Google Home device.

People are also replacing the time spent with other devices to use smart speakers. The report showed that just over a third of Americans are ditching their smartphones to spend time with the speakers, while 30 percent are using the devices instead of watching television.