Power Classs is a bluetooth technology that determines the transmission distance.Most mobile phones and devices today use Class 2 with a standard transmission distance of 10 meters.The communication distance of Class 1 is about 80~100 meters.It is usually used in high-power/long-distance bluetooth products. Due to high cost and power consumption, it is often used for commercial special purposes.

Compared with Class2, Class1 has higher power and longer communication distance, so the corresponding Class1 radiation is larger.

Feasycom few typical Class 1 module

From above diagram you can see that if class 1 spp module ,only FSC-BT909 can meet the requirement .FSC-BT909 it is a class 1 spp module which always use as long range data transmission.BT4.2 and it adopt CSR8811 Chipset .