Electronically connects your DECT headset base to your telephone Enables remote operation, answer/end calls, for wireless headset use with various phones, thus eliminating the need for a mechanical handset lifter For use with Siemens/Unify OpenStage 30, 40, 60, 80, OptiPoint Basic, Std, Adv, Eco 410, 420, 500, 600 phone models and Aastra /Mitel 5370, 5370ip, 5380, 5380ip, 6739i, 6771, 6773, 6773ip, 6775, 6775ip, 7434ip, 7444ip, and *6735i, *6737i, *6753i, *6755i, *6757i phone models