Speaking of the Cobra Tag, it's been a wonderful device for me to use as a trusted device... Until I installed KitKat yesterday.
On KitKat the Cobra Tag randomly disconnects from the phone, sounding the separation alarm and locking the phone. Very disappointing.
I'll have to test the Cobra Tag on my Nexus 5 to see if it can maintain the BT connection with a different KitKat device.
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I had issues with all of my BT devices that were all solved by unpairing and the re-pairing the devices after 4.4 installed.