The reliable, easy-to-use Panasonic KX-TGM420 amplified cordless system is the home phone solution for everyone affected by mild to moderate hearing loss. It simplifies everyday calling with voice volume up to 40 dB to clarify caller voices, and a speech booster to ensure that callers hear you. And for amplified calling ease and comfort throughout the house, the KX-TGM420 system can be expanded to include six full-featured handsets. Easy to See, Easy to Use The amplified KX-TGM420 not only makes everyday call management easier, but also more convenient with enlarged touch controls. Backlit, easily visible buttons let you choose six tones for clarifying different voice types. Plus, boost volume for caller voice amplification up to 40 dB and set ringer tone volumes up to 100 dB. A white-backlit LCD and enlarged backlit numeric call dial keypad make calling quick and simple in any light conditions. Audible/Visual Call Alerts To complement the system''s 15 ringtone options, bright red LED visual ringers on the base unit and handsets also flash when someone calls. And together with Panasonic''s Talking Caller ID, the KX-TGM420 system not only alerts you audibly and visibly to incoming calls, but also tells you who''s calling in English or Spanish. Slow Down Fast Talkers To understand quick-talking callers and voice messages, the KX-TGM420 comes with one-touch Slow Talk control to automatically slow the speed of speech while conversing in real time. It''s ideal for clearer conversations and conference calls, screening incoming calls and voice message playback. Slow Talk touch buttons are conveniently located on both base unit and handsets. Power When the Power Goes Out Two built-in backup batteries in the base unit keep you connected when the power goes out. When fully charged, the batteries provide power for up to 13 hours of continues use and up to 9 days standby. Additional Conveniences Make everyday calling, conversing and messaging easier with these additional features: Speakerphone Intercom DECT 6.0 Plus for extended signal range Noise reduction for clearer calls from noisy locations Talking digit keypad 100-number phonebook 250-number call block 9 speed dial numbers up to 17 minutes of voice messaging