Familiar sophisticated design If you've been paying attention to Fitbit over the past few years, Sense will sound very familiar to you. It's not precisely an exact copy of the Versa, but it is very similar, with a more rounded design but still boxy. It is slightly larger than Versa 2, but identical in Versa 3 (40.48 x 40.48 x 12.35 mm). The Versa 2 mechanical button has been replaced with an inductive button, giving the Sense a sleek, one-piece aesthetic.