1. Durable materials: Our large button telephones use high-quality ABS materials, sturdy desktop telephones, durable and long service life. 2. No battery required: This large button telephone is powered by the telephone line. We do not need to install batteries; it is both energy-saving and environmentally friendly. 3. Easy to install: This telephone only needs to be inserted into the spiral wire and power cord; plug and play, easy to use. 4. Preset number: This large button telephone can preset home number, SOS number and meal order number. It is easy for the elderly to make calls. 5. Humanized design: You can replace 9 pictures of your family and friends on the keyboard. It helps the elderly to quickly find the numbers. 6. SOS One Touch Speed Dial: Red button design, the SOS button is easy to find to make emergency calls.