I realize this is a few months old and off topic for the thread, but it's one of the few references I've found to the 2.4Ghz chip used in the Magic Bands. The nRF24LE1 isn't a Bluetooth LE chip. Are you sure it's a nRF24LE1? I found some internal shots of the long range transceivers
here and it looks like they're using TI CC2541 chips which are Bluetooth LE, but also have the ability to be programmed to proprietary protocols. I've even seen reference to the CC2541 proprietary protocol being compatible with nRF's
here. I assume they're talking about the nRF24 series. I'm really hoping they're nRF24 compatible....