Apparently the batteries last longer when used in 'watch' mode, but it's only 30 days. My concern would be that, with such a short battery life, users will have to make a point of charging / wearing it. If that's the case, then they might as well go the whole hog and pack a mini oscilloscope in their pocket. The 30-day battery life defeats the object slightly IMHO. If you had a watch with all the features, but could last a few yrs on a battery, that would rock. Especially if you could put the probes out on a pulley, James Bond-style You'd be able to debug an amp that's failed in the middle of a party - none of this 'I haven't got my tools, guys, sorry.' - there'd be no excuse. It'd be great...