• More than a third of the wearable devices sold by 2021 will be smartwatches, Forrester says, with sales hitting $21 million.
• By 2021, sales in the US will reach $9.8B, with smartwatches accounting for more than a third of devices sold, the research firm projects.
• Wearables have to really connect with other devices in the Internet of Things ecosystem.
• Sales will grow from $4.2 billion in 2015 to $9.8 billion in 2021, the report says.
• Forrester: Nearly 1 in 3 Americans will use a wearable device by 2021

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