Jasco 19208 - Manual (Page 5)

Push Button Jumpers Chime Jumpers
5. Jumpers 1-6 are used to select 1 of 64 possible home security codes.
6. To change the house code, add or remove jumpers as needed. It is
recommended to change only one jumper at a time and then test the
system for proper operation. Positions 1-6 on the chime and pushbutton
must match exactly.
Push Button Mounting Instructions
Note: Avoid mounting the push button on metal surfaces, as it may result
in a reduced range of transmission. Do not mount in an area of rain (direct
weather.)
a. Removing the back cover