Only for size, yes. But this watch can't be used as normal watch because of charging. So I like the idea to still be able to use the watch as a normal one when you charge the battery. So it really can becomes your only one watch. A little battery watch in watch casing and another one (like the one in our Gs-sport device) for gps in the bracelet. With -I hope- a nicer look than NavRun 500 and with Gs-Sport signature as well.
But thanks for pointing this one at me!