The decline - the first since the market started in 2013 - is expected to reverse next year after Apple and Google launch important operating system updates this fall, IDC said. Also, more watches will launch with cellular connections to LTE wireless without the need to connect via Bluetooth to a smartphone.

Apple was the only smartwatch maker in the top five to see a decline in the second quarter, although the Apple Watch remained the top smartwatch by far, with 1.6 million devices shipped and 47 percent of the market, IDC said.

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