The gray JBL Charge Speaker features two full-range drivers and a built-in bass port to provide exceptional audio for all your music. It supports Bluetooth wireless audio streaming from compatible devices and has an aux input. It also has a built-in USB port for charging mobile devices. Plus, you can listen for over 12 hours using the speaker's built-in rechargeable battery. A built-in LED light lets you know when the built-in battery needs to be recharged, and when the speaker is in Bluetooth listening or pairing mode.