1) as of 2010July, Bluetooth has a total of six versions of V1.1 / 1.2 /2 /2.1 /3 /4
2) to the communication distance in different versions can be subdivided into Class A (1) / Class B (2).
1.1 is the early version, transmission rate is about 748~ 810kb / s,LED Lighting module because of early design, susceptible to the same frequency interference of products under the influence of the quality of communication.
1.2is also the only 748~ 810kb / s transmission rate, but with the ( Software improving anti-jamming hopping function ). ( too much in-depth technical theory no longer expatiatory! ).
4) the communication distance version
A Class A ) is used in the large power / remote Bluetooth products, but because of the high cost and large power consumption of Bluetooth, not suitable for personal communications products ( mobile phone with Bluetooth headset Bluetooth Dongle and so on ), it is used in some commercial special purpose, the communication distance is about 80~ 100M distance between.
B Class B ) is currently the most popular formats,Bluetooth keyboard device communication distance of about8 ~ 30M, depending on the product design, used for mobile phone Bluetooth headset Bluetooth Dongle personal communications products, power consumption and volume is small, easy to carry.