Sennheiser's HD 450BT headphones have lots going for them, from crazy-long battery life to impressive noise canceling. That's not to say they're without issues.
Sennheiser HD 450SE review
Sennheiser HD 450SE review: Smarter than your average can?
Review: Sennheiser HD 450BT Reliable Sennheiser Headphones
SENNHEISER HD 450BT Bluetooth 5.0 Wireless Headphone with Active Noise Cancellation - 30-Hour Battery Life, USB-C Fast Charging, Virtual Assistant Button, Foldable - White
Best Sennheiser headphones: brilliant headphones for every style and budget
Sennheiser HD 450BT headphone review: Clean sound and design - Gearbrain
Cheap Noise-Canceler – Sennheiser HD450 BT Review
Sennheiser HD 450BT review: comes with compromises but I like them anyway
Sennheiser HD 450BT review: These headphones make my ears hurt
Review: Sennheiser HD 450BT Wireless Over-Ear Headphones
Sennheiser HD 450BT Review - Expect Average
Wireless Closed-back Bluetooth Headphones with USB-C Charging, Bluetooth 5.0, Microphone, Active Noise Cancellation, and Customizable Listening
Sennheiser HD 450BT Bluetooth Wireless Headphones - Black