Everyone has motioned the short vs long range RFID, and the approximate battery life for the long range, and no way to test long range without using it and seeing what happens.
I just wanted to add...
If you go to the parks often, and have older graphic bands you like that might have dead battery, but still want the Long Range RFID features (auto linking pix on 7Dwarfs, HM, Pirates, etc.) you can always buy the cheapest band you can get at the parks or on
Shop Disney, along with a Magic Keeper and a carabiner from a local sporting good store... Link the new band to you, remove the puck, aka icon, from the new band, put it in the Magic Keeper and carabiner it to your bag/belt loop.
I have a MK 45th Tiki Room band that makes special sounds/colors at the tap points in the MK. I also have two Epcot 35 bands, and a Pandora Opening band. They all do colors/sounds at their park's tap points.
So I wear the special band on my wrist, and use a carabiner to click a newer icon via Magic Keeper, to my bag. I get the colors/sounds when tapping, and still get our pictures linked
