With Wireless Bluetooth 5.0 Streaming, you can stream wirelessly from your device and even switch between two devices so that you don't miss a call. Dynamic frequency response range (Hz) 20 Hz – 20 kHz 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. Easily control your sound and manage your calls from your headphones with the convenient buttons on the ear-cup.. Note:If you face issue in Bluetooth connectivity please turn off the Bluetooth function for a couple of minutes, then turn it back on 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 designed to fit nearly any head size comfortably