In the box there is a warranty card for a 2-year warranty from the manufacturer with a serial number. The sound quality is not as good, but this is normal considering the features of the headphones. As already mentioned at high volume, everything (everyone) is heard, so the drivers will "tickle" your ears. The headphones do not turn off themselves after a long period of inactivity, but I'm not sure if this affects the charge level. For my purposes I'm happy with my purchase.
Huawei Freebuds Pro MermaidTWS with Active Noise Cancellation - Silver Frost
299 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 Earbuds with Advanced Noise Cancellation, Bluetooth 5.2, and 3-Mic System for iOS and Android (Carbon Black)
295 Review
Massdrop x Koss Porta Pro X On-Ear Headphones: 🎧 Noise-Cancelling Mic, Voice Assistant, Track Skip | Collapsible Midnight Blue
314 Review
Sony MDR-ZX310AP ZX Series Blue Wired On Ear Headphones with Mic: Immersive Sound Experience
48 Review
Purple Philips SHE3590PP/28 In-Ear Headphones - Superior SEO
189 Review
Bose QuietComfort 25 Acoustic Noise Cancelling Headphones with 3.5mm Wired Connection for Apple Devices - Black
43 Review