50dB extra loud amplification 6-level tone control and noise reduction Slow-talk control in real time Amplified digital answering machine 112dB loud ringer with bright red visual ringer Amplified speakerphone with tone control Up to 3 more expansion handsets can be added. The KXTGM450S is a reliable and easy-to-use phone which improves many of the problem areas that those with hearing loss struggle with. Speech is louder with 50dB amplification, clearer with background noise reduction and tone control. Fast talkers are better understood with slow talk control while conversing in real time or listening to messages on the answering machine. The loud 112dB ringer with its bright red visual will always let you know when someone is calling! The (2) included KXTGMA45S expansion handsets have all the same features of the base phone and come with their own charging dock. Built-in battery back-up?a fully charged handset provides up to 13 hours talk time and 9 days standby. (2) Ni-MH rechargeable batteries AAA (R03) are included with base. With DECT 6.0 technology there is improved range and superior transmission between the base and handsets. You can expand with up to 3 more handsets for convenience in multiple rooms (see Accessories). Additional Features: 3 memory buttons Talking caller ID, keypad and phonebook Call waiting/Caller ID 15 different ringtone options 2.5mm headset/neckloop jack 100 phonebook entries English and Spanish LCD Hearing Aid Compatible Feature Details Brand Panasonic Warranty One year warranty Color Grey / Silver Weight (lbs) 4.42 Battery operated? Yes (batteries required) Batteries included? Yes Battery details (8) AAA NiMH Corded / Cordless Cordless Line-Powered No Battery backup Yes Expandable Yes Bluetooth No Degree(s) of Hearing Loss Mild Moderate Severe Yes Yes Yes Amplification (dB) 50 Boost override Yes Captions No Tone Control Yes Speakerphone Yes Answering machine Yes Caller ID Screen Yes Talking Caller ID Yes Talking Buttons Yes Photo Buttons No Outgoing speech amplification No Emergency Dialing No Low Mobility No