How big is Flow? Plume Team September 23, 2017 06:55 Updated Follow Flow dimensions: 125 x 40 x 35 mm (Flow with strap) 56 x 56 x 33 mm (Dock) Related articles When will Flow pre-orders be shipping? How accurate is Flow? How long does the battery last? Do I need a smartphone / tablet and the companion app to use Flow? What do the LEDs on the front of Flow mean? Comments 0 comments Article is closed for comments.