This is for an open box 6160VADT keypad that is branded ADT in the bottom right corner, works with all Vista system. Be sure to hold buttons (1 & 3) at the same time before disconnecting your old keypad to get the keypad address. Write that number down, it’ll be either 16, 17, 18, 19 or 31. Be sure to take a picture of the wires on the back of your keypad before removing them since some builders don’t use properly colored wires. Change it to the keypad address you wrote down then hit a few times to get out of the addressing mode. After about 15 seconds try to enter your 4 digit code and arm your system.