This large/big button phone is a great design for people with low vision and hearing impaired. Enlarged font and extra-large keys make the keypad easy to use, which is especially helpful for those who are visually impaired. Complete Batteries Free - This phone is line powered completely, no need to install any battery. Easy to set up - Connect the phone to your RJ11 telephone jack by the phone line included in the parcel, no need extra accesories to start working. Clear Voice: The call quality is stable and clear, easier to understand. World-wide home phone, English manual provided. Functions on the elderly phone include a hands-free speakerphone, perfect for anyone on the go at home, hold, auto, store, redial, and flash functions,handset volume control and speaker volume control by press the VOL +/- when using the handset or the speakerphone.