Up to 200H Playback Time and Bluetooth 5.3 It only takes 2 hours to fully charge the 2200 mAh case,and providing earbuds with up to 200 hours of looping playback time. And the earbuds provides up to 6-7 hours of single play time after 1H single charge.Use the latest 3rd Bluetooth 5.3 chip to provide faster and more stable signal connection and lossless sound transmission.HiFi Stereo Sound Effect and Two Main Earbuds DesignThe wireless earbuds built-in high-quality audio chip can preserve the original sound of the music to the greatest extent, providing clear high-pitched and strong bass stereo high-fidelity sound quality. The dual main ear transmission design transmits signals to the two earbuds respectively, which means that you can use two earbuds at the same time or use one earbud at random. These two methods bring continuous and convenient music enjoyment.IP7 Waterproof and Wide CompatibilityBuilt-in nano-waterproof coating, class 7 waterproof design, can prevent the water from entering the earbuds after immersing in water, suitable for running even in rainy days, and suitable for sweating in the gym or various outdoor sports(such as walking,hiking, jogging, etc.)These earbuds are basically compatible with most Bluetooth-enabled devices, such as phones, tablets, laptops and computers.Smart OperationTurn on your phone's Bluetooth and search for "H66" to connect, and You can press a button on any of the earbuds to play, pause songs, volume control,answer, hang up or reject calls, and activate Siri, freeing your hands.During music:Click once L or R earphone to Play/Pause;Double click R earbud to Next Track,Double click L earbud to Previous Track;Long press R earbud to up volume,Long press L earbud to down volume;Quick triple click L or R earbud to activate voice assistance.