Link to Youtube

I'm new to electric guitar (but not to playing guitar) and struggling to figure out what FX they use on the guitars here especially for the distinctive lick in this song.

I figure it's a delay but since I don't hear any notes actually repeating does that mean it's a VERY short delay?

It's a cheerful sound I would like to know how to use, rather than wanting to cover this song specifically.

Sorry if this isn't the right forum?