palmOne Treo 650 Using Instructions page 59

Headset specifications
Your Treo 650 smartphone uses a 2.5mm, 3-pin headset connector and works with
headsets that are designed for this type of connector. When in doubt, ask the third-
party headset manufacturer if the product is compatible with Treo smartphones. If you
hear a headset buzz or poor microphone performance, your headset may be
incompatible with Treo smartphones.
Your Treo smartphone is also compatible with headsets enabled with Bluetooth
1.1 wireless technology. This includes most of the headsets with Bluetooth wireless
technology currently available, as many of these headsets support both Bluetooth 1.1
and 1.2 wireless technology. Check the specifications for your headset to confirm
compatibility. Please note, however, that you cannot use a headset with Bluetooth
wireless technology to listen to MP3 files.
In addition to the headset
that came with your Treo
smartphone, you can use
other third-party headsets.
To hear stereo through the
jack (such as music), you
should use a stereo
adapter or other accessory.
Visit www.palmOne.com/
us/support or more
information on audio
accessories and for the
latest compatibility info.
The headset designed for
Treo 180/270/300 devices
is not compatible with your
Treo 650 smartphone.
Using a phone headset :: 57