Motorola MD71 5.8 GHz Cordless Accessory Handset for MD700 Series Phones For use with Motorola MD 700 series expandable cordless phones 5.8 GHz digital signal; 4-line backlit LCD Caller ID, visual call-waiting and voicemail-waiting indicators Speakerphone, 3-way conferencing, custom ring tones Hands-free and handset-to-handset intercom functions; belt clip