BT 4.0/BT Low Energy and the HTC One

I know the HTC One has BTLE, but what is out there for us to take advantage of it? What I really would like is a bluetooth dongle that attaches to my keys and pairs with my HTC One using BT4.0/LE; when in range, no pin is required. When out of range (such as when I step away from my desk), a pin is required. Any ideas?