This smartvwatch is pretty good, it's not a fitbit but it does what want and that's to purely track how much I walk in a day. It does also track heart rate and can track cycling.
This does link to a mobile device via Bluetooth but you must download the independant app for it , This is all explained in the instruction book.
Has a cool little feature to help find your phone , doesn't come with a charger but will plug into any is charger takes about 1hr 3omins to fully charge up.
Interface is very simple and easy to use