MATERIAL: This wired big button landline phone is made of ABS material, which is durable, wear resistant, and can be used for a long time. EASY TO READ: With large easy to read buttons and larger ringtones, one touch dialing, caller ID, handsfree support, this phone is undoubtedly the perfect grandma and grandfather. EASY TO OPERATE: This phone is very easy to operate with only the necessary features designed for seniors. Just plug in the included power cord and it will work. EMERGENCY NUMBER: You can pre store the SOS calling number in this dial button. When your grandparents need help, they can pick up the handset and dial the 911 button to save time. PRE STORAGE: M1 and M2 keys, you can pre store family numbers. In this way, the elderly don't need to look for the phone book every time they make a call, just pick up the handset and dial M1, M2, and it will be connected.