Wireless headset with active noise canceling function and up to 50 hours of continuous playback. Amazon exclusive brand. - Model Name: Srythm NiceComfort 25 - Color: Black - Speaker Size: 40mm - Frequency Response: 20Hz - 20kHz - Bluetooth Version: 5.0 - Battery Capacity: 1000mAh - Continuous Playback Time: Approximately 50 hours - Noise Canceling Function: Active Noise Canceling Set Contents: Type C cable Audio cable Quick Start Guide Flight adapter 3.5-6.5mm adapter This item is brand new and has never been opened. I received it as a gift, but I don't use it, so I'm selling it. ^ ^ Please note that I do not know the details of the set contents.