Vtech DS6101 Two line Accessory Handset with Caller ID and Speakerphone for Use with DS6151 DECT 6.0 Digital technology provides the best sound quality, security and range in cordless phonesnewly available frequency band that provides improved range without needing to boost the power. The sound quality on our DECT models is superior to existing 2.4 GHz and 5.8 GHz models and enables the user to talk anywhere in their home or office without interference from a wireless network. This proven and reliable technology has been in use for a number of years in Europe and has proven to provide brilliant quality of voice and sound, high protection against eavesdropping and better range than 2.4 GHz and 5.8 GHz phone systems.2line operation our twoline phones are perfect for a busy home or small business. Twoline phones allow you to place a caller on hold and dial out on the other line, or even conference an outside call between lines.Caller IDcall waitingstores 50 callsReturn phone calls and recall numbers with 50 name and number caller ID memory. Caller ID service requires a subscription from your local telephone company.Handset speakerphoneenjoy handsfree conversationsWith just the touch of a button, handsfree conversations are made easy with the handset speakerphone.Hearing aid compatible phones have a reduced noise and interference when used with most Tcoil equipped hearing aids and cochlear implants.Interference free for crystal clear conversations won't interfere with wireless networks and other electronic devicesProtect yourself from identity theft with digital security your call is digitized and encrypted, making it nearly impossible for someone to eavesdrop.