Mac.to_string

You're seeing just the function to_string, go back to Mac module for more information.

Specs

to_string(t()) :: String.t()

Converts a mac address to a string

iex> Mac.to_string({255, 255, 255, 255, 255, 255})
"FF:FF:FF:FF:FF:FF"

iex> Mac.to_string({6, 1, 2, 3, 4, 5})
"06:01:02:03:04:05"