1. Bluetooth version: 5.22. Waterproof grade: IPX53. Frequency response range: 50Hz-20KHz4. Speaker impedance: 32ohm5. Battery capacity: 280mAh6. Continuous play time: 8 hours7. Charging time: 2 hours8. Standby time: 300 hours9. The magnetic design of the headphone head does not wrap around for easy storage, and it is light and fashionable to wear and is not easy to lose10. The neck hanging is made of liquid silicone material, which is elastic and smooth like a babys skin, warm and comfortable, and can be bent at will11. Life-level waterproof, all-round protection, no harm to the earphones even if sweating profusely, anti-stain erosion, long-lasting durability, no fear of sweat and rain12. 5.2 Bluetooth chip, more stable transmission, easier connection, smoother calls and music13. Ergonomic design, the golden ratio is superimposed three times, firmly worn and comfortable in the ear14. Multi-function buttons to easily control music and make calls15. Audio and video synchronization, zero delay in wireless audio transmission16. Bio-diaphragm, three-dimensional surround subwoofer, high-efficiency Bluetooth transmission efficiency, richer details and layered experienceSpecification: Package Weight One Package Weight 0.05kgs / 0.12lb One Package Size 15cm * 15cm * 3cm / 5.91inch * 5.91inch * 1.18inch Qty per Carton 500 Carton Weight 27.00kgs / 59.52lb Carton Size 50cm * 50cm * 54cm / 19.69inch * 19.69inch * 21.26inch Loading Container 20GP: 197 cartons * 500 pcs = 98500 pcs40HQ: 458 cartons * 500 pcs = 229000 pcs