2
1.
1.
1.
1. About
About
About
About BT
BT
BT
BT DF
DF
DF
DF 311
311
311
311 Bluetooth
Bluetooth
Bluetooth
Bluetooth speakerphone
speakerphone
speakerphone
speakerphone
This versatile Bluetooth speakerphone is portable and specially
designed for the people who want to use their cellphone while
driving.
BT
BT
BT
BT DF
DF
DF
DF 311
311
311
311
is built in advanced CVC technology
for Echo cancellation & Noise ppression.
BT
BT
BT
BT DF
DF
DF
DF 311
311
311
311
has
a LCD display to show the caller's name or number, it is also
built-in Text-To-Speech engine, provides the artificial-voice
prompting for operation and caller's name or number spelling.
BT
BT
BT
BT DF
DF
DF
DF 311
311
311
311
brings excellent hands-free conversation
quality and convenient, safest way to talk and drive.
2.
2.
2.
2. About
About
About
About Bluetooth
Bluetooth
Bluetooth
Bluetooth technology
technology
technology
technology
Bluetooth is a short-range wireless communication technology.
The Bluetooth wireless technology makes it possible to
connect any compatible portable and stationary
communications device without using cables. The technology
is based on a radio link that offers fast and reliable
transmission of voice and data information. Bluetooth refers to
a worldwide standard designed to operate in the internationally
recognized ISM (Industrial Scientific and Medical) frequency
band. Within the ISM band (2.4GHz~2.485GHz), Bluetooth