Bluetooth Radio Frequency IO

via Wikipedia.com:

Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Created by telecom vendor Ericsson in 1994,it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices, overcoming problems of synchronization.
Bluetooth is managed by the Bluetooth Special Interest Group or SIG, which has more than 18,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics. Bluetooth was standardized as IEEE 802.15.1, but the standard is no longer maintained. The SIG oversees the development of the specification, manages the qualification program, and protects the trademarks.To be marketed as a Bluetooth device, it must be qualified to standards defined by the SIG. A network of patents is required to implement the technology, which is licensed only for that qualifying device.

Also:

PIC32 development board and bluetooth datalogger Ben Stabler
This is a development board for the new PIC32 microcontrollers. It features onboard ICSP programming (just plug in a serial cable), EEPROM bank and interface to the BISM II bluetooth module (see: http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0188949) (which means it should also work with the WISM wireless lan chip by the same manufacturers). Ben Stable
Bluetooth headsets emit very little RF radiation. It turns out that a wired cellphone headset can actually deliver more RF to your head than a bluetooth set. A ferritebead with a wired cellphone head set can prevent this.