JBL Charge 5 Altavoz Bluetooth portátil​​ 

No this device does not have a radio. -Joe

This device does not have a headphone jack. ~Peter

Please reach out to manufacturer for more information. ~Peter

Please reach out to manufacturer for more information. ~Peter

A red flashing light for the Charge 5 Portable Bluetooth Speaker means power on, low battery: https://support.jbl.com/howto/what-do-the-led-colors-mean-1427373437288-us/000033814.html

Thanks for your inquiry. Setting the volume and the EQ to its maximum level may pose a risk to your JBL Charge 5, particularly when playing audio that is already bass-boosted. This can lead to distortion or rattling, potentially damaging the speaker's driver. Similarly, playing louder songs with the bass set to maximum may also pose a risk. Alternatively, you can still adjust the bass in the EQ and experiment with playing loud or bass-boosted songs. However, it's important to monitor for any signs of distortion or rattling. If you encounter these issues, adjust the settings until the sound is clean and meets your expectations for a satisfying listening experience.

Thanks for your inquiry. Our GG, TL, and CS models come from different production centers i.e. different suppliers to fulfill the production capacity but the product specification should be the same. Products from different suppliers are just having different execution in the design but the quality should be identical. To know if your product is authentic or counterfeit, you may reach out to us, so we can check it for you.

This speaker does not sync with other JBL speakers. ~Jesse

We hear you. To control our JBL Charge 5 it must be connected first to the device and the JBL Portable App. It can be turned off by the app but you'll have to turn it on manually. As of right now, that is not a feature but we appreciate your feedback and will forward this along to the appropriate teams. If you need more help with the unit, please contact our customer support.