No sync issues. It catches very well, through 3 walls in the apartment. We used it with an iPhone 6. I didn’t like the sound quality, but it might be tedious to set it up with an equalizer. Few points. I gave it to a girl, she didn’t want to reconfigure it, she says she likes everything. They sit a little strange in the ears. You have to flip it up. Noise isolation is excellent, there are 3 types of nozzles
Black Huawei FreeBuds 3 Wireless Bluetooth Earbuds for Superior Sound
276 Review
🎧 HUAWEI Freebuds 4i: Wireless Earbuds with Active Noise Cancelling & 10H Battery Life in Black
279 Review
🔴 Sleek Mystic Red Samsung Galaxy Buds Live with Active Noise Cancelling - Wireless Earbuds
274 Review
Huawei Freebuds Pro MermaidTWS with Active Noise Cancellation - Silver Frost
299 Review
Panasonic RP-HS46 Slim Clip-Type Earphones in White: Quality Sound On-the-Go
76 Review
Sony MDR-ZX310AP ZX Series Blue Wired On Ear Headphones with Mic: Immersive Sound Experience
48 Review
🎧 Experience Unmatched Audio Quality with Marshall Major 4 Bluetooth Headphones
104 Review
Bose QuietComfort 25 Acoustic Noise Cancelling Headphones with 3.5mm Wired Connection for Apple Devices - Black
43 Review