GeekerMart · 極客谷 Garmin Vivosmart 4 Smart Activity Tracker (Size: S-M, fits wrist of 4.8 - 7.4" (122 - 188 mm)) (APAC English version, Chinese is not available) https://www.youtube.com/embed/5ctr3yhTRE8 * Pulse Ox at Your Wrist The Pulse Ox sensor on vívosmart 4 estimat Product #: geekermart-Garmin Vivosmart 4 Smart Activity Tracker (Size: S-M, fits wrist of 4.8 - 7.4" (122 - 188 mm)) Regular price: $HKD$880.0 Available from: GeekerMart · 極客谷In stock