With the OnePlus Buds Pro, you can listen to a personalized sound reproduction. In the HeyMelody app, the earbuds measure which frequencies you do and don't hear. Based on this test, it creates a personal sound profile. That way, you can listen to a personalized sound. Thanks to active noise canceling, distracting ambient noise and white noise are reduced. As a result, you'll be less disturbed by your surroundings. On a full charge, the batteries lasts for 7 hours. Is the battery empty? Put them in the charging case for 10 minutes and you can listen to music for 2 hours.