It is also sold on other sites. 【OS】: Wear OS by Google.
CASIO PRO TREK Smart WSD-F20-BK GPS Android Wear Wi-Fi Bluetooth Smart Watch
CASIO PRO TREK Smart WSD-F21-BK GPS Android Wear Wi-Fi Bluetooth Smart Watch
CASIO PRO TREK Smart WSD-F20 GPS Wear OS Watch Black Box Android Used
Model: PRO TREK Smart WSD-F20. It is in working condition. – Wear OS by Google. This item was sourced in Japan. – Color Touch Display. Color: Black. Case Size: Approx. 1.98 × 2.22 × 0.60 in (50.3 × 56.4 × 15.3 mm).