I don't develop on irDA or BT so have never had any need to go into depth details. Period. I wanted you to share some of your thoughts since you develop on it. My reason for moving from irDA to infrared spectrum is the scope that covers the infrared range, which covers the infrared diode unlike the wireless set frequency limitations of bluetooth. Lets focus on the use in the very popular remote control systems in consumer electronics as this was that got my interest going from an earlier thread. Why is it that most manufacturers still use this old school system and not bluetooth? I think the irDA technology is very reliable, does not suffer from interferences, and is quite simple to implement. Each light pulse is decoded on the receive side as a particular signal pattern that corresponds to what the decoder processor is programmed to respond to and is a direct tranlsation of light pulses into signal levels. Due to its simplicity and reliability, it will be favoured over other technologies like BT or Wireless. The only disadvantage has been the line of sight but I think this is no longer due to better diodes with a broader focal and light emitting range. These are my basic thots so far. I sometimes notice the rudeness of people on this list when I post things, I've so far not reverted and kept track of the discussion. I hope to maintain this. Over to you, go ahead and share since you are quite deep in BT research as you develop on it and will know much more than many of us. Rgds.