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This noise cancelling earphones do not require a battery box. It draws power from the smartphone or tablet.
In order for the processor to cancel the noise, the noise for cancelling the environmental noise captured from the microphone with music is sent to the earphones. Existing noise cancelling earphones have needed power from battery box until now.
This unit can receive both music and power through one Lightning cable. Further, as music uses a digital signal, the music quality is better than when listening via an earphone jack.
No batteries can make noise cancelling earphones compact. And it can be prevented the charging forget.