power hungry? your kidding right :-) seriously no joking around power is not a problem today. a $10 lithium cell will run any BT device for "months" of usage.

the advantage of bt4 is a COIN CELL will run them for a year.

I am just really shocked at how few a number of "REGULAR" bt devices their are considering how rare bt4 is.

my mytrek armband HRM is regular bt (one of the few) sure it only goes for 5 hours but seriously. how many of us go more than 5 hours straight?

even a mediocre rider like me can cover 75 miles in 5 hours (once I get into enough shape :-)