| Answer | Crossword Clue |
|---|---|
| MEGAPHONES | Amplifiers without wires |
| preradio | way of transmitting sound by electromagnetic waves, without wires |
| radio | way of transmitting sound by electromagnetic waves, without wires |
| radios | way of transmitting sound by electromagnetic waves, without wires |
| radio | signalling through space, without connecting wires, by means of electromagnetic waves / to transmit by radio |
