Subject: RE: Garmin Foot podnot really true about the batteries. The bigger one (the one for $119.99 on the site ) uses the watch battery, has the auto-off. The newer is smaller and can be fit into certain shoes on the inside (not sure which shoes, maybe nike+? ). I have no experience with the smaller one, so not sure of its feature set. I've never seen mention of it tracking cadence, so that could be a difference. The bigger one is still pretty small, you won't notice it on your shoe, and once calibrated it's just as accurate as the 305 or 405. |