Well, last two pages seems to be quite ok (for me ) because frequencies and transmission techniques match. 802.11b uses DSSS (one form of spread spectrum techniques) if I remember correctly and it's mentioned there, also the frequncy is 2.4G which is ok. Bluetooth also uses spread spectrum techniques and if I remember correctly, it's FHSS in BT case. And there is a mention in the first case: "Low Power Transmitters below 1 GHz (except Spread Spectrum), Unintentional Radiators". That could be something related to AC voltage and charger, don't know. But the word "unintentional".