JBL Tune Flex 2
 features
Audio and sound: They feature 12mm dynamic drivers and deliver JBL Pure Bass sound. JBL Spatial Sound is included to create an immersive audio experience for music, movies, and games.
Adaptive Noise Cancelling: The earbuds use Adaptive Noise Cancelling to block out distractions while Smart Ambient technology lets you hear your surroundings. The TalkThru function allows you to have quick conversations without removing the earbuds.
Call quality: With six built-in microphones, the 
Tune Flex 2
 is designed for clear calls, even in windy conditions. The JBL Headphones App also allows you to customize your call experience.
Battery life: You can get up to 12 hours of playtime on a single charge with ANC off, or up to 8 hours with ANC on. The charging case provides an additional 36 hours of battery life, for a total of up to 48 hours of playback.
Connectivity: The 
Tune Flex 2
 uses Bluetooth 5.3 and includes a Multi-Point Connection, so you can seamlessly switch between two different devices. For Android users, it is also Fast Pair enabled.
Customization: The JBL Headphones App offers various personalization options, including adjusting the Adaptive Noise Cancelling level, Ambient Aware settings, creating relaxing playlists, and customizing the touch controls.