The 5.8 GHz VTech mi6896 four handset system offers a wealth of telephony features: three-mailbox answering system, caller ID, speakerphone, intercom, 50-location phonebook, mute, volume control, page feature, and much more. With 5.8 GHz phone technology, you get ideal performance when it comes to clarity, range, and security. You're also on a much less trafficked area of the bandwidth than either the 2.4 GHz or 900 MHz frequencies.