DUAL CONNECTIVITY: The 3.5mm audio adapter supports you to add an external 3.5mm microphone audio to for Action 4 and Action 5 Pro for clear, high-quality sound recording even during high-speed sports like riding. USB-C CHARGING: Equipped with a USB-C port for charging the battery while using the microphone, you can operate video recording for hours. You can also use it alone to connect audio devices with Type C connectors, or to transfer data. FIRMLY FIXED: The audio adapter has a customized snap design at the interface with your for Action 4 or for Action 5 Pro, which is firmly fixed and not easy to fall off when recording. !!!Please don't pull straight when removing it to avoid damaging the adapter or camera connector! WARM TIP: 1. 3.5mm port only supports microphone, not headphones. 2. It's NOT compatible with for Action 1 / Action 2 / Action 3. The expanded Type-C port supports charging when the 3.5mm port is in use with a microphone. Color:Black Material:plastic Package Contents: 1 * Audio connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.