Backpack Large Capacity Expandable Backpack Multifunction USB Charging Business Bag For Laptop Up to 17.6″ Luggage Bag – Black

Frequency Response: 20Hz-20KHzMoving Coil Type/Diameter:40mmCable Length:2.2m (Braided Cable)Sensitivity:108 +/- 3dBMaximum Power:30mWResistance:32 Ohm +/- 15%Speaker Diameter:40mmHeadset Connector Type:AUX 3.5mm + USB 2.0Microphone Resistance:≤2.2K ΩCurrent:80mAVoltage: DC 3VWeight:296g