Redesigned Apple Watch Series 4 revolutionizes communication, …
https://www.apple.com/newsroom/2018/09/redesigned-apple-watch-series-4-revolutionizes-communication-fitness-and-health/
WebSep 12, 2018 · Apple Watch Series 4 is more than an evolution — it represents a fundamental redesign and re-engineering of Apple Watch. It’s offered in two sizes, 40mm and 44mm. The speaker is 50 percent louder, optimized for phone calls, Siri and Walkie-Talkie, and the microphone has been relocated, to reduce echo for better sound quality.
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