[Exclusive Sound Quality with Deep Bass] Features with the most advanced Bluetooth 5.0 technology ensures an incredible sound quality with deep bass.Built in 8mm large size speaker driver offers a Truly Natural, Authentic Sound and Powerful Bass Performance. [LONGER BATTERY LIFE-Up to 125 Hours] It is up to 5 hours playing time when headphones fully charged. Else the portable charging case capacity was 3000mAh it could recharge the earbuds 25 additional times. The total play time could be up to 125 hours. In addition to charging the earbuds, the charging case can act as a power bank for charging mobile phones and other USB devices. [One Step Stable Easy Pairing Technology] Built in the most advanced Bluetooth Chip that Never worry about walking away or losing your connection again. pick up 2 headsets from charging box They will connect each other automatically, then only one step easily enter mobile phone Bluetooth setting to pair the earbuds. [Secure Fit&Comfortable Design] Cshidworld Earbuds was the Ergonomic 120° tilted in-ear design makes you free from fatigue even long time of wearing.ensures perfect fit for your ears, never worry about dropping easily during exercises.New in-ear design,provide 3 different sizes of ear caps for needs of different customers. that suitable for almost everyone's ears. [AFTER-SALE SERVICE] 30 DAYS NO REASON MOENY-BACK GUARANTEE and 18 moths Replacement Warranty, support 7*24h technology service, 24 hours quick reply.Just contact us directly at our customer support if you have any questions.