How big is Flow? Plume Labs Support Team November 24, 2018 16:49 Updated Follow Flow dimensions: 125 x 40 x 35 mm (Flow with strap) 56 x 56 x 33 mm (Dock) Related articles How accurate is Flow? How long does the battery last? Waking up your Flow Is Flow waterproof? Do I need a smartphone and the companion app to use Flow? Comments 0 comments Article is closed for comments.