Features: Bluetooth + MP3 function support stereo music playing, phone calling.  Support all audio devices that have Bluetooth capability, such as, cell phone, tablet PC, laptop, computer etc.  3.5mm audio plug, provides a simple wired connection of a variety of devices without Bluetooth.  Allow you to answer or reject phone calls anytime and anywhere.  Charged via USB, rechargeable battery, convenient and practical.  Playing time about 5 hours, standby time up to 120 hours.  Good quality, cut design and adjustable length hinges, very comfortable to wear and easy to carry.  Best choice for listening music, watching movie, chatting online etc.  120 degree rotatable microphone picks up your sound accurately and provides you clear phone call.     Specifications: Model: AKZ-K23;  Wearing Type: Over-Ear;  With Microphone: Yes;  Volume Control: Yes;  Bluetooth Version: V5.0+EDR;  Supported Profiles: HSP/HFP/A2DP/AVRCP;  Transmission Distance: 33 feet (10m);  Frequency Response: 20-20kHz;  Battery Capacity: 300mAh;  Charging Time (h): 1-2h;  Music Time (h): 5h;  Standby Time (h): 120h;  Connectivity: Bluetooth/ 3.5mm Aux-In;  Interface Type: Type-C/ AUX-In;     Package Included: 1* Headphones;  1* User Manual