This is the S2H replay; an activity monitor/pedometer thing that does a similar job to the fitbit. Except it feels way more like the future than the fitbit because it's cheap, fashiony and simple. And they'll actually deliver you one outside the US.
There's a simple watch unit that fits inside a rubber band/casing - which means you can get loads of different colours.
It tells the time and measures how active you are in four chunks of 15 minutes each. Represented by these little bar charts / level meters. Complete an hour of activity and it gives you a code you type into the Switch2Health website - no USB, no wifi, no bluetooth, no whispersync - any browser, any computer, a bit of typing and you're done.
Your hour of activity gets you rewards - downloads, ringtones etc. I reckon about a week of ordinary activity will get you a month of Club Penguin. And there are leader boards and all sorts of capacity for games to be built on top of the activity monitoring.
And if you're not being active enough it tells you with a smiley face or a frowny one.
It's good because it's dumb, simple, obvious. (And rabidly commercial - they're furiously building a commercial ecosystem for this thing.) There's not much to go wrong. (Except my browser keeps warning me that the commerce site is 'untrusted'.) This feels like another prototype of a measuring pebble; something small and simple that will enhance my devices, something I can afford to break or lose but that connects to my expensive, unreliable, easily damaged phone/pad/whatever. And using the code to connect is genius - no need for capacitive sausage skin or hacking into the headphone jack. Easy, cheap, good.