Extra Large Buttons- This landline phone is characterized by large keys, easy to view and push numbers, so that anyone can easily use it, especially suitable for the elderly with visual impairment ^^ Speed Dial- This corded desk phone has three one-touch speed dial keys M1 / M2 / 911, which can be used to program frequently contacted phone numbers. 911 button is pre stored 911 numbers. If you want to change it, just follow the steps to re store a new number, and the old one will be erased ^^ Last Number Redial- This function allows you to redial the last call, very useful to call back immediately when your first call stops unexpected ^^ Adjustable Volume- 3 levels handset volume adjustable: HI/MED/VHI; 2 levels ringer volume adjustable: LO/HI. When you switch the ringer volume to HI, the extra loud ringer is compatible with seniors with hearing impairment ^^ Ringer Indicating LightWhen there is an incoming call, the indicating light on the phone will light up with the ring to remind you of a new call