Expandable Cordless Phone System features two lines, dual Caller ID, digital answering system, & DECT 6.0 technology for the best sound quality, security & range in cordless phones. Interference-free technology delivers crystal-clear conversations that won't interfere with wireless networks & other electronic devices. Digital security protects you from identity theft. Your call is digitized & encrypted, making it nearly impossible for someone to eavesdrop. Phone system includes a handset & base & is expandable up to 12 handsets using only one phone jack. Dial & receive calls on two different phone lines with one phone. Dual Caller ID / call waiting stores 50 calls. Telephone also features a speakerphone in the base & handset, 50-name / number directory, keypad on base, any key answer, remote message retrieval, handset volume control, page / handset locator, selectable ring tones, & blue backlit keypad & screen.