SD7501 5.8GHZ Digital System Expansion Handset for SD7500 5.8GHz Accessory Handset Motorola 5.8GHz accessory handset and charger For use with the MOT-SD7561 and MOT-SD7581 systems Handset has audio connection (only) to the 7504 camera (hear and talk through camera) Caller ID, call waiting caller ID