Got this Casio Pro Trek WSD-F21HR. WearOS, mil-spec durability, heart rate + other sensors useful in outdoors activities and most importantly dual layer screen that can show just the time, reputedly for
Casio announces a cheaper version of its Wear OS watch for hikers - The Verge
Casio unveils a slightly cheaper addition to its Wear OS-based Pro Trek lineup - 9to5Google
Casio unveils its first G-Shock smartwatch with Wear OS | Engadget
カシオ、有機EL搭載Wear OSスマートウォッチ「PRO TREK Smart」。地図付きで3日間動作 - AV Watch
The Casio WSD-F21HR has a heart rate monitor, finally - Android Authority
Casio announces its WearOS-powered WSD-F30 PRO Trek smartwatch releases in early 2019 - PhoneArena
Casio Pro Trek Smart Wear OS Smartwatch Launched | Ubergizmo
Casio Pro Trek Wear OS Smartwatch Has Heart Rate Monitoring - TizenHelp
カシオ プロトレック スマート「WSD-F30」をレビュー!【試用レポート】
Casio Pro Trek WSD-F30 review: Dual-screen success?