The siemens gigaset dune cl540h a stylish gap compatible additional handset the gigaset cl540h is the correct additional handset for the gigaset dune cl540a cordless phones features include a brilliantly large tft full colour display aone touch loudspeaker and integrated phonebookexcellent sound the handset benefits from hsp and hdsp sound protocols the sound quality of conversations on the gigaset dune cl540h is assured even whilst using the speakerphone easy set up you will have