Making Communication EasyEasy-to-see and easy-to-push big illuminated keypad with large characters. Digital Cordless Phone with Big Illuminated Buttons.HAC (Hearing Aid Compatibility) SupportKX-TGJ423EBig Buttons with Large CharactersEasy-to-dialThe big illuminated keypad with large characters is easy-to-see and easy-to-push. It also has a simple and user-friendly key layout that even the elderly will find comfortable to use.Three Dedicated Memory Dial Keys on HandsetEasy access to the numbers you call frequentlyMemory Dial enables you to dial with a simple operation. It is useful for storing the mobile phone numbers of family members to contact in an emergency or friends you call frequently.lessQuick Volume ControlEasy to improve call volumeYou can use the volume keys and the Amplify key on the side of the handset to easily control the volume without interrupting your conversation. Simply push the Amplify key to boost the volume to about 2 times the normal level. While talking using speakerphone. this feature is not available.HAC (Hearing Aid Compatibility) SupportEnjoy clear conversations. wearing a hearing aidThis handset is designed to work well with a hearing aid.Call BlockReduce unwanted calls such as telemarketersThe call block feature blocks the ringing from phone calls if the entire registered number (1 - 24 digits) is found starting at the beginning of the phone number. The feature helps to reduce unwanted calls such as toll-free calls. and helps to keep your personal time from being interrupted.Requires subscription to Caller ID service offered by your provider/telephone company.Key Lock on HandsetPrevent Accidental Phone CallsUsing this feature. you can easily prevent accidental phone calls or settings. allowing you to leave your phone safely in your pocket.Zero EmitCompletely eliminate radiation while the phone is in standby modeBy activating Zero Emit Mode. the unit completely stops radio wave transmission while the unit is in standby mode.