What is the film on the Q2/ Q4 bottom case used for? Zoe February 28, 2023 07:58 It is for ESD protection. Related articles The Q0 has 21 keys and I would like to use 21 macros, However, I can only see 16 macros in the VIA app, why is that? For the Q1/ Q2/ Q3/ Q4/ Q5, why can't I use Capslock to change the input language source on the Mac?