The accuracy of this device is off only by 5% of steps that you've actually taken.

It has an easily replaceable battery that has a lifespan of six months. You don’t have to worry about charging your device.

Device stores data itself, there's no need for smartphone. You can view charts and graphs of your workouts right off the screen of the device.

You can clip it on your waist, put it in your pocket or keep it in a bag. Because of its tri-axis technology it will be precise regardless of how you use it. The only thing that you should avoid is putting it flat on its back.