As far as I knw these Xm4s are released for sale in batches... I placed order with Connect-IT in early Jul n they mentioned it will be delivered from Aug onwards according to Sony. So I believe u already missed the earlier batch purchase...
1. Improves Bluetooth connection stability
2. Improves an issue where the noise canceling function or Ambient Sound Mode is momentarily interrupted under specific conditions.
3. Improves other functions.
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