
Fitbit Charge HR Activity Tracker: This heart rate and activity tracking wristband is built to capture your movements and health patterns all day long. Easily monitor your heart rate so you can maximize your workouts, learn about your sleep quality and monitor progress on your goals. 
Q: How does this charge when it doesn't come with a charger?
A: It comes with a usb charges that connects to your computer to charge. However, if you want to charge it without a computer, you need to buy a separate usb converter to charge using an outlet.
Q: how do you know if you should get a large or small?
A: IF you go to the Fit BIt website it tells you how to find your size. You measure your wrist and it will tell you if you need a large or small.
Q: Do I need a Smartphone to benefit from this tracking device?
A: No, but you would need a computer with Internet access (or a way to install fitbit's software). The HR comes with a USB-Bluetooth adapter and a USB connector to directly connect the device. You can use Fitbit's website and/or software on your computer with virtually the same features as the smartphone app.
A: The Charge HR will display your heart rate and the zone. Depending on how you set up your display (mine is set to show heart rate last) will determine where you see it in the rotation. The display does not stay on constantly for anything. You have to tap the top to get what you've set to be your face display (mine is clock), or press the side button to scroll through to see each item.
Q: Does it track your spinning or riding a bike (distance, calories, etc?)
A: Unfortunately not. The activity tracking primary relies on the movement of your arm. It will, however, track your heart rate while on the bike.
Q: Will this fitbit affect a pacemaker?
A: The Fitbit will not interfere with a Pacemaker
A: You might have received a used or previously opened unit as they do come with a USB charging cable, & a bluetooth dongle included with two very small booklets with some minimal instructions & contact information. In the bottom portion of the display stand which is part of the packaging, you should find that it holds both booklets & the communication dongle along with a 3 or 4 inch long USB charging cable (which plugs into the rear of the FitBit.
Q: Do I have to carry my iphone with me?
A: You don't "have" to carry your phone with you. The Fitbit will hold all the data and it will Sync with your phone or Mac/PC later. However if you like to run and you tell the Fitbit App your running it will track your location, speed and distance more accurately using the Phone gps. The Fitbit can only calculate distance based on the number of steps.