Permission to say "I'm good" when the flight attendant offers you the cheap airline headsets. Think of Fly Bi as a little dongle that magically “connects” any headphone jack to your own wireless earbuds or headphones. And if that’s not enough goodness, Fly Bi will transport sound to two people—you with your AirPods, them with their Beats Studio Pro, for example. Perfect when you want to series binge on the plane with your travel buddy. Also great for gym equipment & gaming systems. Got a headphone jack? This works. Rechargable with included USB-C cable. Tech Specs: Charging voltage 5V, Working current 16mA±2mA, Shutdown current 15uA±2uA, Battery 240mAh, Bluetooth 5.3, Transmission distance 10M, Charging time 50 min, Play time 16 hrs. Materials: ABS + Electronic Components. Dimensions: 2.125" x 1.125" x .375" plus integrated 2" cord/headphone plug.