Wi-Fi-friendly Cordless Phone System is expandable up to 12 handsets and requires only one phone jack. DECT 6.0 Digital technology will not interfere with wireless networks and other electronic devices, and provides excellent sound quality, security and range in cordless phones. Calls are digitized and encrypted, making it nearly impossible for someone to eavesdrop. Phone system includes digital answering system, Caller ID, and four handsets with speakerphone for hands-free conversations. Caller ID/Call Waiting stores 50 calls. Phone system allows you to intercom and transfer calls between handsets. Digital answering machine offers 14 minutes of recording time, access from handsets, audible time, and date stamp on recorded messages and backlit message counter. Phone system is hearing aid compatible and features handset volume control, page/handset locator, selectable ring tones, and voicemail waiting indicator. Mount phone to wall with the included bracket.