This speaker has a USB-C charging protection safety feature. This safety feature will play an alert sound & cause the LED indicators to flash when the charging port has detected water, salt, or other chemical. When you encounter the alert you will need to remove the charging cable, wipe down any excessive moisture on or around the charging port, and leave the speaker in a area to completely dry off. Once it is completely dry, you'll be able to plug the USB-C cable back in and charge your speaker.