Bluetooth v4.0 Dongle?

I’m on the market of buying a bluetooth 4.0 for a smell netbook i have, and i would like to know a couple of things first.
Does Version 4 come with EDR? Cause i remember versions 2.0/2.1 coming with it, eg You could see 2.0 + EDR when buying such dongle.
Does Low-Enrgy profile mean that the dongle consumes less energy or the devices connecting to it as well? Cause that would be pretty interesting to see.
Answer #1
Bluetooth 4.0 LE (low energy mode) is only for when connecting to low energy products which are mainly based in healthcare industry/fitness accessories I think… If your sending audio/more data hungry signals I think the bluetooth dongle falls back to v2.1 EDR or 3.0 HS (High Speed) mode…
To be honest I don’t think connecting with a 4.0 bluetooth dongle is going to save much batter life of the laptop or the connecting device over bluetooth 2.1 or 3.0….
Here are a few good articles you should read for comparison of the different versions:
http://www.quora.com/What-is-the-difference-between-Bluetooth-4-0-3-0-and-2-0
http://ankitmathur111.wordpress.com/2012/06/20/bluetooth-2-0-3-0-and-4-0-discussed/
Hope this helps