Bluetooth is an industrial specification for
wireless personal area networks (PANs). Bluetooth provides a way to
connect and exchange information between devices like personal
digital assistants (PDAs), mobile phones, laptops, PCs, printers
and digital cameras via a secure, low-cost, globally available
short range radio frequency.
Bluetooth is a radio standard primarily designed for low power
consumption, with a short range (power class dependent: 10
centimetres, 10 metres, 100 metres or up to 400 metres [1], ) and
with a low-cost transceiver microchip in each device.
Bluetooth lets these devices talk to each other when they come in
range, even if they are not in the same room, as long as they are
within up to 100 metres (328 feet) of each other, dependent on the
power class of the product. Products are available in one of three
power classes:
1. Class 1 (100 mW) [still readily available]: It has the longest
range at up to 100 metres (328 ft).
2. Class 2 (2.5 mW) [most common]: It allows a quoted transmission
distance of 10 metres (33 ft).
3. Class 3 (1 mW) [rare]: It allows transmission of 10 cm (3.9 in),
with a maximum of 1 metre (3.3 ft).
for more info, pls refer to wiki
or
www.bluetooth.com
