Difference between AGGER Base and other AGGER models?

The communication module is the integral part of each set of the micro earphone. So in the AGGER Ultra, Pro and Nano models this module is wireless, i.e. connection to the mobile phone realizes by means of Bluetooth. The AGGER Base model has in the standard set the communication module which is connected to the mobile phone through 3,5 mm audio socket. This model is intended for use with devices without Bluetooth function (old models of mobile phones, radio sets, MP-3 payers, etc.)

Thus, you should choice AGGER Base model if your mobile phone or other means of communication does not support the Bluetooth function, or for any reasons you will not be able to use Bluetooth connection.