Hi Isolation RF Isolation: >50 dB from 800 MHz to 2 GHz Built - in Antenna Coupler Coupling Factor to between two built-in PCB antennas in open space (1-inch away from coupler surface): 8 dB from 824 MHz to 960 MHz 12 dB from 1700 MHz to 2000 MHz Fixture to place handsets at the same position Sample of Connection Example of Connection with the Tester or JRC (GSM/ EGPRS/W-CDMA/HSDPA)