Features: 1. in-ear design 2. IP54 waterproof and dustproof 3. One-key reset, simple operation 4. 12mm large dynamic coil, dual microphones to reduce noise 5. A single use of 5 hours, with a long battery life of up to 20 hours with a charging box Product specifications: 1. Wiress connection: Bluetooth 5.2 2. Communication distance: 10m (barrier- open environment) 3. Net weight of single earphone: about 4.5g 4. Total weight with charging box: about 51g 5. Earphone battery life: about 5 hours 6. Headphone charging time: about 1.5 hours 7. Charging time of the charging box: about 2.5 hours 8. Headphone size: 40.7x16.9x18.7mm 9. Charging box size: 49.6x49.6x24.4mm 10. Charging interface: Type-C Packing list: Charging box x 1 Charging cable x 1 Instruction manual x 1 Headphones (with M earplugs) x 2 S earplugs x 2 L earplugs x 2