Features of VTech DS6421-3 DECT 6.0 Digital Answering System: * The frequency band has been extended allowing for the signal to be reproduced for a fuller, clearer sound. * Push-to-Talk intercom. * DECT 6.0 Digital technology provides the best sound quality. * Interference free for crystal clear conversations. * Protect yourself from identity theft with digital security. * Expandable up to 12 handsets using only one phone jack. * Return phone calls and recall numbers with 100 name and number caller ID memory. * Digital answering system. * With just the touch of a button, hands-free conversations are made easy with the handset speakerphone. * 50 name and number phonebook directory. * Trilingual prompts  Choose between English, Spanish, and French. * Wall mount bracket included.