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

Impendance：16Ω±15%ø10mm moving-coil speaker unitWireless digital chip with pop-up windowOne-button wired control, for music and callTPE cable, tangle-free and easy to storeErgonomic design, comfortable wearingCTN SIZE:60*33.5*49CM