International business trips: Real-time translation for meetings, confidently navigate negotiations; flight noise reduction for a fully charged battery upon landing. Language learning: Instant text conversion of foreign teacher conversations makes listening practice more efficient. Dynamic noise reduction technology for inter-language translation lets you hear only what you want. Music lovers must-have: Hi-Fi-grade sound quality and immersive listening in noise reduction mode ensure every note is pure. Order now to start your "Hear and See the World" experience without boundaries! Provides dual solutions for cross-language communication barriers and noisy environments. Noise reduction decibels:-40dB Bluetooth version:5.3 Input voltage:5V Sensitivity:106db Frequency response:20hz-20KHZ Impedance:32 ohms Battery capacity:45mAh Bluetooth distance:above10M Bluetooth starting frequency:2402-2480MHz A2DP HFP HSP AVRCP Charge time: about 60minutes Music playing time: about 2-4 hours Talk time: about1-2hours Charging box Battery capacity:350mAh Charging time: about 2 hours