> referring to the commercial availability of Bluetooth modules that can listen to messages sent up to one kilometer away. Is this accurate? I had no idea. Fo

> referring to the commercial availability of Bluetooth modules that can listen to messages sent up to one kilometer away. Is this accurate? I had no idea. Following the link it's not clear to me if you can use this module to pick up 'ordinary' bluetooth from a km away (as they imply), or if you'd need a similarly 'strong' special bluetooth on the other end to communicate over 1km.