Vtech Cordless Answering System with Caller ID features DECT 6.0 Digital technology. Provides the best sound quality, security and range in cordless phones. Interference free for crystal clear conversations won't interfere with wireless networks and other electronic devices. Protect yourself from identity theft with digital security your call is digitized and encrypted, making it nearly impossible for someone to eavesdrop. Caller ID/call waiting stores 30 calls. Digital answering system no tapes or moving parts with 14 minutes of recording time. 30 name and number phone book directory easily store and dial frequently called numbers.