Signal Transmitted Without a Physical Connection

This page is the CodyCross answer for the clue below from Taking Care of Our Planet, Group 1576, Puzzle 3 (Underground Reservoirs).

Question is: Signal Transmitted Without a Physical Connection

and the answer is: WIRELESS

Word Meaning:

WIRELESS — Not having any wires.

Definitions from Wiktionary.

Signal Transmitted Without A Physical Connection - Taking Care of Our Planet CodyCross Answers | CodyCross Solutions