Thanks for sharing your thoughts on the Galaxy Buds3 Pro, Hung. To ensure a secure and comfortable fit, it is important to use the right size ear tips, as they come in various sizes to accommodate different ear shapes. A proper fit minimizes gaps between the ear and the earbud, which helps prevent sound leaks and enhances audio quality. If you need assistance with changing the tips, you can find a helpful guide in the link provided. Once you have selected the appropriate ear tips, check the bottom of the earbuds for the directional marks indicating L for left and R for right. Insert the right bud into your right ear with the R facing you and do the same for the left bud. Angle the earbuds slightly so that the microphone points towards your mouth for better clarity, and adjust them until they feel comfortable. Additionally, running an earbud fit test in the Galaxy Wearable app can help ensure you have the ideal fit. We hope these tips enhance your experience with the Galaxy Buds3 Pro. If you have further questions, please feel free to reach out to us at Samsung Support. -Kelvin https://www.samsung.com/us/support/answer/ANS10003496/ smsng.us/Samsung-Support smsng.us/Facebook-Messenger smsng.us/X-Messages smsng.us/Samsung-Community smsng.us/Warranty-Info smsng.us/Samsung-Care-Plus