New Backpack Laptop Simple Business Travel Oxford Cloth Waterproof Expandable Size Multi-Section & USB Power Charger Extension Up to 17″ Laptop Size – Black

Bluetooth version: 4.1Support Bluetooth support: MP3 / WMA / WAV / SBCOperation distance: 8-10msensitivity: 105db +/- 3dbRechargeable lithium battery: 300mAhSpeaker parameters: 40mm, 40m W * 16ΩSNR: 90dB-100dBcharging time: 2-3 hoursThe maximum output distortion: ≤1