ZAGG Boost - Manual (Page 4)

4. OPERATION
4.1 Near FA™ Wireless Operation
iOS Devices:
When in Standby or Power On modes, placing an iPhone™, iPod™, or other device,
with the external sound or music being played in the correct direction activates the
speaker. Example - align the bottom of the iPhone™/iPod™ to the front of the speaker:
Android and other Devices:
Different audio devices require different positioning.
Experiment with the placement of the device until
the device and speaker sensors are in alignment.