Fitbit's latest fitness "super watch" has some pretty nice features, including:

Built-in GPS

Wrist-based optical heart rate monitor

Wireless syncing to smartphone or computer

7+days of battery life without gps and up to 7h with gps (according to some reviews)

Remove the four screws

The bands are glued pretty well so you need to cut your way through to remove them and expose the fibit body

Cutting through the middle and lifting sideways worked pretty well

Once you remove the bands scrape away the glue on the top side to expose the GPS antenna

On the other band you'll find the bluetooth antenna which is actually a flexible antenna glued to the inside of the band

With the bands out of the way it's time to go inside Fitbit's guts

Remove the four metal parts as shown in the photo

After that just insert a screw driver or other sharp object into the fissure and voilá

Right after splitting Fitbit into 2 the first component is immediately exposed

Cypress CY8CTMA463 touchscreen controller

After removing the large shield on the main PCB the brains of the gadget become visible

Silicon Labs EFM32 Giant Gecko (ARM Cortex-M3) EFM32GG395F1024

Micron Serial NOR Flash N25Q064A11ESEA0F

(Cypress touchscreen controller still visible here plugged into the main PCB)

After removing the battery holder the main PCB can be carefully dislodged from the plastic body

Texas Instruments Battery Charger BQ24232H

MediaTek GPS Receiver MT3339 (couldn't find any datasheet, just a press release on it)

Texas Instruments Bluetooth Controller CC2564

The LCD is secured with 3 very visible screws on the bottom side

Sharp TFT-LCD LS013B7DH01

Here are all the parts after the teardown