Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bigger than a watch but functional

It is on the large size but not too big. Battery life seems to be excellent. It takes a minute to acquire the satellites but will acquire much quicker if you are not wearing it but rather leave it on a table or ground while it is trying to acquire the satellites.My chief complaint is I wish the heart rate readout on the device was larger. It is hard to read while running.