NOTENot applicable for fast charging cables or fast charging adapters. Please don't charge it with PD fast charger adapter or >15W high power charger adapter, it's easy to damage the earbud.If you have any questions about this product, please feel free to contact us. We will answer your questions within 24 hoursMini, in-ear & Invisible designThe body weighs only 3 grams, the headphones are small in shape and size (0.7 x 0.6 x 0.47 inches), the color is invisible and the size is small, so there is no flickering of light when you use them, Easy to hide in your ears and they are not easy to be noticed. Can be used secretly in classroom, workplace.Lightweight & IPX5 WaterproofComfortable to wear on both left and right ears. The headphones are so comfortable to wear that you'll forget you're wearing them, and you won't feel fatigued even after long hours of use. Everyday Life Water and Sweat Resistant standard protects the headphones from sweat, splashes and rain. Ideal for active scenarios such as sports and workouts, ideal for active scenarios such as sports and workouts.MINI Rechargeable Storage CaseComes with a 260mah rechargeable case, which not only prevents the Bluetooth earphones from being lost, but can also be recharged repeatedly at the same time. The earphones can be recharged 3-4 timesEnjoy up to 12-17 hours of music playback and 150 hours of standby time. No need to worry about power shortage. A charging case the length of One and a half-coin ,Takes up very little space and can be easily stored anywhere you want.One-Touch Design & Physical Buttons Physical buttons can avoid a lot of mis-touch situations compared to touch buttons. The one-touch design allows one-handed operation. With one-touch operation, you can play/pause music, listen to the next song, start/end/reject/redial a call, and more. Compatible with 99.9% of electronic devices with Bluetooth. For example: iPhone X/8/8 Plus/7/7 Plus, Samsung Galaxy, computers, tablets.