Here is the if you are asking a forum or support community, followed by a summary of the manual if you are trying to operate the phone.
: Features receiver and speakerphone volume control (4 steps each) and a ringer volume switch (Off/Low/Hi) located on the bottom of the base. Vtech Cd111a User Manual
Connect the included AC power adapter to the base and a standard wall outlet to ensure the backlit display operates optimally. Line Connection: Here is the if you are asking a
To ensure longevity, the manufacturer advises against placing the unit near water or heat sources and recommends using only a damp cloth for cleaning. The phone is also made with antibacterial plastic to support hygiene in shared office spaces. Line Connection: To ensure longevity
Allows you to hear the caller, but prevents them from hearing you.