2.4GHz Digital Technology 1Caller ID/Call Waiting Caller ID Compatible 2Handset Speakerphone with Volume Controls Shock Resistant Handset Splash Resistant Handset Voice Enhancer39 ChannelsRemote Channel SwitchingNiMH Battery Handset Backlit 3 Line LCD 30 Caller ID Memory and Dialer Voice Mail Message Waiting Indicator (FSK & Stutter Compatible)Easy Operation (Menu Driven) 50 Station Phone Directory and DialerHandset Locator Wall Mountable Hold/Mute (Handset)6 Selectable RingtonesHeadset Jack & Belt ClipLighted Handset Keypad Low Battery IndicatorFlash buttonRedial (Last 1 or 5 numbers dialed)Handset Volume Control (Low/Med/Hi) Ringer Volume Control (Off/Low/High) Out of Range IndicatorColor Blue1 Range based on open field testing. Actual range varies and depends on physical and atmospheric conditions.2 Requires subscription to telephone company service.