data at least 20 meters(probably dependent on the transmitter power on the other end). Richard suggested that they could be good for wireless debugging, perfect for it. They are about $8 NZ($6.60 US). I think this is the datasheet I used http://www.hmangas.com/Electronica/Datasheets/Bluetooth%20Module/Bluetooth_HC-05.pdf I am planning to order some if anyone wants one. Jimmy