Sennheiser US has announced that Certified Refurbished units of its current flagship wireless headphones are now available for sale at a considerable discount compared to their original starting price. The adaptive ANC-capable Momentum 4 Wireless are also available new at up to 34% of this amount on Amazon.https://www.notebookcheck.net/Get-up-to-180-off-Sennheiser-Momentum-4-Wireless-as-officially-refurbished-headphones.882244.0.html
Don't be tempted. I bought some Sens. Left channel didn't work, returned them for repair as instructed, came back un-repaired. I will never buy Sens again.