A:AnswerHi - The wall mount bracket for the VTech IS8252-4 is sold separately. Please contact our Customer Support at 1-800-595-9511. We are open from 9:00 AM to 5:00 PM, Mondays through Fridays.
Thank you,
-VTech Support
A:AnswerHi - The VTech IS8151-4 does not have a battery back up on the telephone base, hence the system will not work during power outage. If you are interested with the said feature, you may check the model IS8151-4.
Thank you,
-VTech Support
A:AnswerHi - The VTech IS8251-5 is a 5 handsets telephone system. The telephone base can register up to 5 handsets. You can get the IS8201 accessory handset as a replacement if in case one of the handsets in the system stops functioning.
Thank you,
-VTech Support