1. The 3.5mm TRS input port on the back is for connecting 3.5mm three-stage microphones and does not support 3.5mm headphones. Make sure that the charging handle has power when using a microphone.
2. The Osmo Action Multifunctional Charging Handle is not waterproof. Do not use it underwater.
3. While in use, attach the charging port protector and make sure that the USB-C port cover on the back of the charging handle is fully closed.
4. In camera modes that consume a lot of battery power, make sure the battery is installed securely to keep the camera running smoothly.