Main Feature Frequency 20 Hz-20 kHz Signal/Noise Up to -42dB noise reduction Connection Type Bluetooth Version: 5.2 Microphone Yes Battery 40mAh (earphones) 400 mAh (charging case) Battery Type: Lithium Polymer Duration Call Time: 7 Hours Music Time: About 5 hours (70% of the volume). Music time with a charging case: About 25~30 hoursMusic time with a charging case: About 25~30 hours Physical Specification Drivers 10mm Color White Warranty Warranty 6 Month