The RF access point is what enables the user to communicate to and from their PC. It is based on a CC1111 which has an integrated USB device and a compatible RF transceiver. It is a relatively fixed function device meaning that it will communicate with a Chronos pretty easily. The user can transfer data using SimpliciTI™ or BlueRobin™, but it is not incredibly easy to modify that application. If the user wants to communicate over a different RF protocol stack, change the frequency or to change any of the capabilities, they can be modified, but the user will need an external programmer. It will need to be reprogrammed with what TI calls a CC Debugger. One of the more common reasons that the user may want to reprogram it is that in the first units of the Chronos, it actually was missing the wireless update capability. If the user has one of the first production units that were built before April 2010, then it will need to be manually updated to have the RF BSL capability, but all new hardware developed since then has the capability built in. For more information on how to update that that using the CC Debugger, please visit the wiki and there will be step-by-step instructions on updating and adding the RF BSL to that application.