Business Backpack Casual Waterproof Computer Up to 17″ Backpack Student Bag Large Capacity Travel Bag – Black

Type:Wireles headphone (with cord)Battery:400mADriver Unit:40 mmFunction:volumn control, pause/Play device, MIC unctionStead by time:100 hoursPlay time:18 hoursFrequency Response:20 Hz-20KHZCord length:1. 2 mI10%Connector:3. 5 mm stereo plugSensitivity:114dab/mW