Bests & Worsts Reviews from Amazon

this arrived on tuesday, and i am already charging it (in full) for the 3rd time on saturday. the battery is supposed to last 5 days. further it is supposed to warn you - today it went from 32% to zero, fully off - in an hour. the HR feature doesn't seem to have a track function - that's what i bought it for. also the sleep is only so/so accurate. i was really excited to get this, no mas.