What is the 'real' reach of a Bluetooth zone?

If you couple a Class 1 device with a Class 2 device, you can effectively increase the range of the Class 2 device from 10m to up to a maximum of 30 metres for most phones. You CANNOT reach any further than this as the Radio Frequency power output from a phone is simply too low to be able to communicate back to a Bluetooth Marketing device. Bluetooth Marketing is a two-way conversation as the sending device needs acknowledgment from the users phone for permission to send or decline.