Puppy Charging Cable

 The item mentioned and sort of shown in the comic above:

I don't recall where I got it but my charger is too fat for his mouth - he's suppose to fit snuggly to your phone to help the charger get a solid connection but he's just decoration at this point. 

The joke is that memory is measured in megabits and megabytes but if a puppy tries really hard he can give a mega bite :) 

Text:
A: What a cute puppy on your charging cable.
L: He adds memory to my phone!
A: Really?!
L: One mega-bite :)