eppfun AK3046E Bluetooth 5.0 Transmitter for use on Airplane, Share Audio to Any 3.5mm Aux Jack on Airplane, Bluetooth Adapter for Wireless Headphones/Earbuds 
AK3046E wireless adapter is designed for in-flight entertainment systems. 
Engineered with the latest Bluetooth 5.0 technology More Stable, More Reliable. 
the Bluetooth transmitter with rechargeable batteries, can last for 7 hours playtime on single charge. 
One of the jacks folds in, making it ideal for both in-flight entertainment that requires the classic single-pronged jack as well as the two-pronged jacks typically found on international flights. 
Works with 3.5mm audio devices including in-flight entertainment systems, computers, car, and gym equipment.