Its 2.4-inch, high-brightness TFT screen is easy to read even in sunlight. Large backlit buttons make dialing easy and comfortable without glasses. With the KX-TU400’s speakerphone, you can hear the phone ring even in noisy environments. When you press the priority call button, the handset dials 5 pre-set numbers in sequence. The speakerphone is automatically activated. If none of the called numbers is answered, the device sends an SMS message to all 5 numbers on the emergency call list, asking for help. Thanks to the long battery life, the KX-TU400 will not run out of power after a long day.