A:AnswerThank you for your question. The KX-TGM430 has Talking caller ID function. It can be wall mounted, you can access this link for instructions: http://help.panasonic.ca/viewing/ALL/KX-TGM430/OI/TGM430_PNQX7805ZA/TGM430_PNQX7805ZA.pdf#page=79
A:AnswerHHR-4DPANickel metal hydride (Ni-MH) 2 x AAA (R03) size for each handset. The life of the batteries may vary on usage and the surrounding conditions.