Grado's open-back wireless headphones sound better than most $249 Bluetooth headphones, but just don't wear them outside
PROTEAR AM/FM Bluetooth Radio Headphones, Noise Reduction Safety Earmuffs, Rechargeable Hearing Protection for Lawn Mowing Outside Work(Red) - - Amazon.com
Outside Ear Bluetooth Earpiece Wireless Handsfree Headset Bone Transmission Earphones For Sports Driving And Cycling - Protective Sleeve - AliExpress
Amazon.com: Morpheus 360 Aspire Bluetooth Headphones with Wireless Microphone, CVC 8 Noise Cancelling Digital Signal Processing, 40 Hour Playtime, USB Type C Fast Charging, Travel Case - HP7750B : Electronics