Sony PCGA-BA1 - Manual (Page 29)

29 GB
Speed
Bluetooth communications support a maximum data transfer rate of
723 kbps, but actual data transfer rates will vary, depending on factors such
as distance and obstacles between devices, radio interference, the operating
system or the software used, as well as equipment sensitivity and the
performance of the aerial. Data transfer rates are optimized to achieve the
best throughput under a given set of conditions.
Communication range and power
Bluetooth enabled devices are divided into several categories. Power Class
1 devices can communicate within a 10 to 100 meter range*. Power Class 2
or 3 devices can communicate within a 10 meter range*.
The Bluetooth USB adapter is a Power Class 2 device.
* This assumes that no obstacles are present.
Communication range will vary according to whether walls or other obstacles are
located between devices, the material used in walls, the presence of radio frequency
interference and other environmental conditions, and the type of software being used.
Bluetooth standard
In order to facilitate communication between Bluetooth technology
compatible devices from various manufacturers, the Bluetooth SIG has
worked out standards regarding wireless transfer methods, security
implementation, application specific data formats, etc. All Bluetooth
technology compatible devices must be certified according to procedures
approved by the Bluetooth SIG to make sure that applicable standard
requirements are met.
However, even if standard requirements are met, individual device
performance and specifications as well as operation procedures vary, which
means that data exchange may not be possible in all cases.