Problem Of Using Sony Xm3 Headphone As Noise Reducer At Sleep

Sony XM3 headphones can effectively reduce noise during sleep, but need a continuous connection (wireless or audio wire) to prevent automatic shutdown and ensure uninterrupted use while falling asleep.

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This device is wireless, but it does not mean you can use it wirelessly without connection. You must either connect it wirelessly to some other device or you have to plug in the audio wire (no device needed) in order to prevent it from automatic shutdown. It would be annoying if it shuts down when you had almost fallen asleep.