ZF Electronics Part Numbering PR Series

What is the “NN” at the end of part number PRK22J5DBBNN?

The first “N” is Non-Lighted.
The Last “N” is No Rocker Boot.

The Complete part breakdown for part number PRK22J5DBBNN is as follows. For further details see the data sheet.

PR - Series
K - Contact Rating
2 - Single Pole
2 - On-Off
J - 0.146 Solder Tag
5 - Flat
D - on-off marking
B - Black Housing
B - Black Actuator
N -Non-Lighted
N - No Rocker Boot