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Amazon regained the lead in smart-speaker market share during the third quarter after lagging behind Google during the prior six months, according to a report from researcher Canalys.

Amazon promoted its Echo smart speakers going into its annual Prime Day shopping event, while Google cut prices of its Google Home smart devices to remain competitive with Amazon, Canalys said. Google was the top seller of smart speakers during the second and third quarters, the researcher said.

Smart-speaker shipments more than doubled (up 137 percent) to 19.7 million in Q3 2018 from a year earlier.

Amazon shipped 6.3 million Echo smart speakers that have its Alexa voice assistant, while Google sold 5.9 million of its Google Home devices that have Google Assistant.

While Amazon, Google and Amazon are the top sellers of smart speakers in the United States, Alibaba, Xiaomi and Baidu are the leaders in mainland China.