Communication between 2 devices is governed by the capability of the lower power device.

Class 1 devices have a maximum output power of 100mW / 20dBm and an expected of range of up to 100m

Class 2 devices have a maximum output power of 2.5mW / 4dBm and an expected of range of up to 10m

Class 3 devices have a maximum output power of 1mW / 0dBm and an expected of range of up to 10cm

The expected ranges assume an unobstructed environment between the two devices

imo class 2 is the most optimal choice because your portable devices will hardly be farther than 10m from your notebook.

it is at least class 2, if not class 1.  I use it with my printer which is class 2 and it always connects; i doubt it is class 1 but it might be.  because i had the same question i did not spend the money on the bluetake printer adapter which is class 1.