Invention1Version en ligne Adivina el invento par COLEGIO JESUS MAESTRO MADRID 1 It uses electrical energy Hints 1 It was invented in 1904 2 Its waves travel through the air 3 Listen to this 4 Marconi is the inventor of this machine. 5 It is used for listening to music 6 It is in your mobile phone too 7 You can listen to this in your car