Hileo Hi90 TWS Wireless Bluetooth IPX4 Waterproof Earphone Features: 1. Highly breathable and comfortable to wear. 2. Ultra-long standby, both ears can be used continuously for up to 30 hours with a large-capacity charging box. 3. Intelligent digital display of remaining power. 4. The connection speed is extremely fast and the pairing is stable. 5. HD calls, caller number reminder. 6. Intelligent voice prompts in Chinese and English (default is English). 7. Applicable to all smart devices. Specification: 1. Version: V5.2 2. Transmission range: 10 meters 3. Transmission frequency: 2.4GHz ISM 4. Transmission power: -6~4dBm 5. Signal-to-noise ratio: 111+-3Db 6. DC impedance: 16 Ohm +-10% 7. Frequency response range: 20HZ~20KHZ 8. Rated power: 3mW 9. Power: 5mW max 10. Charging compartment battery capacity: 600mAh 11. Number of times available for charging: 2 times 12. Headphone battery capacity: 100mAh 13. Standby time (connection status): greater than or equal to 100H 14. Call time: about 10H 15. Playback time (100% volume): about 10H 16. Charging time: about 2H 17. Charging method: Type-C 5V1A Packing list: 1. Bluetooth headset x 1 2. Charging cable x 1 3. Instruction manual x 1