Fitbit......love it! The one I have I clip on my bra strap....my son and DIL and one other friend also have them and we are all friends. It's fun to jeer and cheer each other on steps. Fit bit does have one that fits on your wrist also. Fitbit will track your sleep also.
mine is a fitbit....not a fitbit force. Paid around $100 for it. Have had it for 1.5+ and never had any trouble with it. If you have a pc you can sync and what not to the PC. My goal each day is to do 10,000 steps.