REDIAL BUTTON: If the number dialed is engaged or you wish to dial the last number called, lift the handset and press and release the redial button underneath. Once a number has been saved in a memory location, you only need to press one button to make the call. A picture or symbol can be placed under the transparent cover on the speed dial buttons so it is easy to see who you are calling Volume buttons let you easily adjust the handset volume to get a loud and clear sound. Corded photograph telephone keypad with big buttons Visual Ring Indicator DORO PhoneEasy 631 - Full Specs, Details And Review Landline Phones Cordless Select the T mode on your hearing aid to enable this feature. Doro PhoneEasy 331ph HEARING AID COMPATIBLE (HAC): The handset has a built-in hearing loop for those who wish to use their hearing aids while using the telephone. SPEED DIAL: The telephone has 3 one-touch photo memories which act as speed dials for most frequently used contacts.