What kind of charger does it need?

You can directly charge the Fitbit using the supplied usb cable connected to a PC/MAC or you will need a USB to AC adapter.

Does this unit communicate via Bluetooth?

Yes. Using your phone you can connect to the Fitbit through Bluetooth and the Fitbit application.

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Fitbit Charge HR Wireless Activity Tracker Wristband Pink / Large (6.2" - 7.6")