Originally posted by Tako Kichi Does a 3-pole plug fit into the 4-pole socket without issues?
Yes, I have tried and it works.
I have a remote control which works with the K3, and it turns out to be using a male 2.5mm to male 3.5mm audio cable cord to connect the camera and controller. Previously, I have bought a male to male 3.5mm audio cable cord to connect my iphone with the card audio system. So I tried to use the cable cord to replace the one used in the remote controller, and it works well.
So, if you have an old wired remote control, you can change it to a K70 compatible one by 2.5mm Female To 3.5mm Male audio adapter.