1. What can be done if the earbuds cannot be turned on?

1. Check if the earbuds are out of charge. Place them in the charging case and connect the case to a power adapter for 5 minutes, then try again.
2. Long press the earbuds for 2 seconds to manually turn them on.

2. What can be done if unable to pair the earbuds with any device successfully?

1. Clear the paired record on your phone A if you intend to pair with phone B.
2. Reset the earbuds using these two steps:
   1. Remove "UGREEN HiTune" from the Bluetooth menu on your smartphone.
   2. Place both earbuds into the charging case, ensuring they are charging. Then, long press both earbuds for 8 seconds until the LED indicators flash blue and white alternately 3 times.

3. What can be done if only one earbud works properly?

1. Check if the earbuds are out of charge.
2. Clean the charging pins of the earbuds with a dry cloth. Then, place the earbuds into the charging case for a try, ensuring a good connection between the earbuds and case.
3. Verify that "UGREEN HiTune" was selected during pairing, not "UGREEN HiTune - R".
4. If the earbuds were previously reset, place them near each other until they flash blue and enter TWS mode properly.

4. How to troubleshoot if the sound keeps cutting in and out?

1. Keep away from 2.4GHz high-frequency transmitting equipment such as microwave ovens, server rooms, or power stations to prevent signal interruption.
2. Use the earbuds near the phone or computer, and try to avoid obstacles.
3. Reset the earbuds with the following steps:
   1. Remove "UGREEN HiTune" from the Bluetooth menu on your smartphone.
   2. Place both earbuds into the charging case, ensuring they are charging. Then, long press both earbuds for 8 seconds until the LED indicators flash blue and white alternately 3 times.

5. What can be done if the sound is very low even after adjusting the volume on the phone?

1. Reset the earbuds via the following steps:
   1. Remove "UGREEN HiTune" from the Bluetooth menu on your smartphone.
   2. Place both earbuds into the charging case, ensuring they are charging. Then, long press both earbuds for 8 seconds until the LED indicators flash blue and white alternately 3 times.
2. Try using another phone.

6. What should be done if the battery life is shorter than expected?

1. Check the audio codec type of your device. Battery life and playing time are determined by the audio codec and volume. For example, aptX at 50% volume plays for 7.5 hours, AAC at 50% volume for 10 hours, and SBC at 50% volume for 11 hours.
2. Fully charge the earbuds to ensure a longer battery life.