1. Bluetooth: 5.3, chip: Zhongke Lanxun 8926B2 2. Battery capacity: charging case 450mAh, headset 70mAh 3. Use time: 11h 4. Size: 74x45x40mm 5. Open clip-on TWS headphones 6. Supports functions such as master-slave switching, up and down song switching, and summoning Siri.