Vtech 5.8 Digital Model I6727 5.8 GHz technology offers you the best available performance when it comes to clarity and security. To be on the 5.8 GHz wavelength means you're on a much less trafficked area of the bandwidth than both the 2.4 GHz and 900 MHz products occupy. For increased sound quality, enhanced range, and heightened security, the new 5.8 GHz VTech products are for you. Two handset systems provide the convenience of operating two handsets using only one phone jack and one base station. The second handset simply needs an electrical outlet to plug into. These systems also allow you to transfer calls, conference an outside call or use the intercom feature between handsets. Return phone calls and recall numbers with 50 name and number caller ID memory. (*Caller ID service requires a subscription from your local telephone company.) With just the touch of a button, hands-free conversations are made easy with the handset speakerphone.