1.Big button phone is a great design for people with low vision and hearing impaire. 2.This phone is line powered completely, no need to install any battery. 3.Easy to set up:Connect the phone to your RJ11 telephone jack by the phone line included in the parcel, no need extra batteries or accesories to start working. 4.Clear Voice: The call quality is stable and clear, easier to understand. World-wide home phone, both English and Chinese are printed in the manual and on the phone keypads.