Avaya 3920 Digital Cordless Phone 700471121 MATCHING NUMBERS / NEW BATTERY
Comes with all what you see in the pictures.
Including the two AC power adapters
Removed from a working system, the battery is new just bought on eBay.
I am not a phone technician. I will not be able to help you install it. Please before you buy it make sure that you have an experienced Avaya phone system technician to install it.