A power generating bearing assembly comprising a power generating subassembly integrated into a bearing. The present invention provides database update through a one-way data link that may be implemented efficiently in real time and with a mechanism for verifying the integrity and operability of the one-way data link for the purpose of database update. The frequency hopping patterns are determined \u201con-the-fly\u201d based on the current bandwidth assignments. Tethers may connect to the electronic device by permanent attachment, by connection terminals on the device, by elements that encircle a portion of the device, or by other means. A second passage part that lies between the first and third passage parts, allows the projections to move rearwardly into recesses that prevent rotation of the retainer and that have forwardly-facing shoulders that abut the retainer to limit its rearward movement.