Bluetooth Range

Bluetooth works over distances of between 10 metres or 100 metres, depending on the Bluetooth device class.

It’s important to consider how far away users will be able to see the call to action.
For example, it shouldn’t be visible at a distance farther than what the Bluetooth node can transmit, or else users may become frustrated trying to connect to a node that’s out of range. (Formore information about device classes, visit
http://bluetooth.com/Bluetooth/Technology/Basics.htm.)

Note that although most Bluetooth nodes may be able to send content over 100 metres (320 feet), most handsets have an effective range of only 10 - 20 metres.