1Mii Airplane Bluetooth 5.3 Adapter for Headphones W/Portable Charging Case Support aptX Adaptive/HD/Low Latency for Use on Airline : Electronics

1Mii B05 Airplane Bluetooth 5.3 Adapter for Headphones W/Portable Charging Case Support aptX Adaptive/HD/Low Latency, Wireless Bluetooth Audio Transmitter for Use on Airline or in Gym : Electronics

Avantree Relay - Premium Airplane Bluetooth 5.3 Adapter for All Headphones, aptX Low Latency, Supports 2 Headphones or AirPods, Wireless Audio Transmitter for in-Flight, TV, Gym, Tablets - Yahoo Shopping

Airplane Bluetooth 5.3 Adapter for Headphones W/ Portable Charging Case Support aptX Adaptive / HD / Low Latency… - U-Photo

Buy Wholesale China 1mii Bluetooth 5.3 Transmitter Receiver For Tv To 2 Wireless Headphones, 3.5mm Jack In-flight Bluetooth Audio Adapter For Airplane & Bluetooth Transmitter Receiver, Bluetooth Adapter at USD 13.02

1Mii Bluetooth Transmitter Receiver for TV/Airplane to Headphones, Bluetooth 5.3 AUX/RCA Audio Adapter with AptX Adaptive/Low Latency/HD Audio, Dual Link, Wireless Receiver for Home Stereo, Boat, Gym : Electronics

1Mii Airplane Bluetooth 5.3 Adapter for Headphones W/Portable Charging Case Support aptX Adaptive/HD/Low Latency for Use on Airline : Electronics

Bluetooth headphone adapters for airplane - 1Mii

1Mii B05 Airplane Bluetooth 5.3 Adapter for Headphones, In-flight Wireless Adapter With Charging Case

Bluetooth Transmitter Receiver, TROND Bluetooth Adapter for TV/PC, Wireless Bluetooth Transmitter for Speakers and Home Stereo, AptX Low Latency for Both TX and RX, Pair with 2 Devices Simultaneously - Yahoo Shopping

Thought I'd share my solution to using my Bluetooth headphones with my Portal. Some of the earlier 3.5mm transmitters posted had poor battery life (4-5 hrs). Enter the Avantree Relay premium Bluetooth