The WI-SP510 has an IPX5 rating, which means it’s protected against splashes and sweat, ideal for working out.
To maintain this IPX5 rating, the USB Type-C charging port needs to be covered correctly. If the lid is not tightly secured, liquid might get inside, and cause the unit to malfunction and damage your headphones.
As you can see on the image below, you should check if the lid completely covers the USB Type-C® port. By leaving a corner unsealed, liquids could find its way into your device.
Below is an example of liquid damage to the USB Type-C charging port.