Bluetootch 3.0 has a big problem on consuming too much power. The new 4.0 specifications allow for smaller devices that require coin-cell batteries to run.

As well as utillising less power, the device also has higher speed data transfer. Version 3.0 was launched last year although it kind of fell flat on it's face due to the power requirement needed. Version 4.0 fixes those problems

Versio 4.0 allows devices to jump onto Wi-Fi 802.11 networks, where it can transfer data at up to 25Mbits per second.

Hopefully with the lower power requirement s and the options to switch to 802.11 netwroks we should start seeing more devices using the Bluetooth sepecifcation.