Item description for Tune 510BT Bluetooth headphones with up to 40 hours battery microphone for call

NOTE: If headset is too tight we suggest placing them over a ball or something of similar size/shape. Leave undisturbed for at least 24 hours. Repeat if necessary. Please also try length adjustments of either earpiece until both sides best fit you.
JBL PURE BASS SOUND: These wirelss headpones feature the renowned JBL Pure Bass sound, which can be found in the most famous venues all around the world.
WIRELESS BLUETOOTH: These headphones stream wirelessly from your device and can even switch between two devices so that you don't miss a call.
UP TO 40 HOURS BATTERY WITH SPEED CHARGE: For long-lasting fun, listen wirelessly for up to 40 hours and recharge the battery in as little as 2 hours with the convenient Type-C USB cable. A quick 5-minute recharge gives you 2 additional hours of music.
MICROPHONE ON EAR CUP FOR HANDS-FREE CALLS: Easily control your sound and manage your calls from your headphones with the convenient buttons on the ear-cup.
ASK SIRI OR HEY GOOGLE: Siri or Hey Google is just a button away: activate the voice assistant of your device by pushing the multi-function button.
Featuring an adjustable headband the Tune 510BT are deed to fit nearly any head size comfortably

Tune 510BT Bluetooth headphones with up to 40 hours battery microphone for call