DESC: Use this 5.8GHz expandable handset with your Motorola MD671 or MD681 cordless phone system. You can have a phone in every room of your house without needing extra phone jacks. Plus, you can use the intercom/conferencing features, as well as the handset speakerphone, handset-to-handset call transfer and selectable ringtones. Includes Call Waiting/Caller ID*. *Requires phone company service.