[Black Includes 1 extension unit]

[white Includes 1 extension unit]

The "Deca-letter LCD screen" (parent unit) is easy to understand with large letters.
Key lock function (base unit) to prevent children from tampering operation.
It will notify you of the name of the person you have put it on with a voice and is equipped with a convenient "new/whoever call function" so you can see the recipient without being near the phone.