The Wrist Of The Story: A Brief History Of Forgotten Proto-Smartwatche
Smartwatch - The Verge
Everything you ever wanted to know about the Casio DBC series!, Page 12
In-Depth: The Apple Watch, Five Years In - Hodinkee
Smartwatch Reviews - The Verge
Historical Perspectives: Meet The Very First Smartwatch: Behold The HP-01, from Hewlett-Packard - Hodinkee
11 Early Smartwatch Attempts That Were Extremely Dumb
Casio Made Smart Watches Decades Before Apple - InsideHook
Casio Databank - Encyc
Casio GMW-15 Moon Phase
Smartwatch - The Verge
The original smartwatches: Casio's history of wild wrist designs - The Verge
Casio Databank - Wikipedia
WYZE Smart Watch, 1.4(44mm) Smart Watches for Women and Men, Activity Fitness Tracker for Android Phones and iOS Phones, IP68 Waterproof, Menstrual/Blood Oxygen/Heart Rate/Sleep Monitor : Electronics