The ifidelity Auto Pair True Wireless Earbuds with ANC combine all the features you would expect from premium True Wireless Earbuds. Built-in sensors on the earbuds determine when the earbuds are in use, pausing the music when you remove the buds from your ears and resuming the music when you put them back in. The earbuds feature transparency mode, which makes it easier to hear surrounding sounds while the earbuds are in use. To block out the surrounding sounds, change the mode to Active Noise Cancellation. With over 5hrs of playback at max volume, you won't need to charge the earbuds often! When not in use, place the earbuds back into the case to charge them up. The case will charge the earbuds four times from 0% to 100%. It only takes one hour and fifteen minutes to charge the earbuds...