It is compatible with Earbud (4th Generation) ANC version, A3055/A3056/A3057 earbuds, and A3059 charging case. It only includes the Left earbud. **Warm Tips: It is incompatible with Earbuds (4th Generation) non-ANC, charging case: A3058, or earbuds A3050/A3053/A3054. If you charge the charging case in advance, you can use it to charge the earbuds when you go out without a power supply. Please note that these earbuds (model number A3055/A3056/A3057) are only compatible with the Earbuds (4th Generation) charging case (model number A3059). Quality: Used but good, OEM (original equipment manufacturer) standard, guarantees the same quality and performance as the original earbuds and provides a reliable earphone solution. Pairing Instructions: 1. Forget your Earbuds from the device list; 2. Plug the charging case with a power source; 3. Put in the new earbud and wait for 30-60 minutes; 4. Open the lid of the charging case; 5.Press and hold the setup button on the back of the case for about 15 seconds, until the status light on the front of the case flashes amber, then white; 6. Connect the earbuds to your phone. **If it does not work, please check if the models of the left and right earbuds match. Package Content:
1 x Left Earbud for Earbuds (4th Generation) ANC version, A3055/A3056/A3057
Exclude the Right earbud and charging case.
Condition: Used: Good.

**Please check the model of your earbuds before you place the order!

Pairing Instructions:
1. Forget your Earbuds from the device list;
2. Plug the charging case into a power source. 
3. Put in the new earbud and wait for 30-60 minutes;
4. Open the lid of the charging case. 
5. Press and hold the setup button on the back of the case for about 15 seconds, until the status light on the front of the case flashes amber, then white.
6. Connect your phone to the Earbuds. **If it does not work, please charge it more times,e.g., a whole night. And please check if the model of the left and right earbuds matches. Please contact us if you have any pairing issues. **Need your patience for the pairing. It might take a longer time!!