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

Available Colors: Pink, Green, BlackWireless version: Wireless 5.3Frequency range:2.402-2.480GHzWorking range: 10mStandby time: 180 daysMusic play time:40 hoursTalk time: 40 hoursCharging time: about 2 hoursFrequency response:20-20000Hz