The Flash, Season 3

Cisco:
You know that thing we used to talk to Savitar?

Julian:
Yes.

Cisco:
[points to the headset] Meet the Electrode-Halo. So basically, these two are linked electromagnetically via Goldtooth.

Julian:
"Gold-tooth"?

Cisco:
[pleased with himself] Yeah, it's... kinda the Cisco Ramon inter-dimensional equivalent of Bluetooth. Kinda proud of it. Anyway, it gives us all the relevant locus information no matter what corner of the Multiverse Barry's stuck in.

Caitlin:
And, if Barry needs our help, it stimulates Cisco's prefrontal cortex.

Cisco:
Then I'll open a breach and pfff... siphon them back in.

Julian:
Good lord. Multiverses, breaches, halos. Easy bloody peasy.

Cisco:
By George, I think he's got it.