Bluetooth Version: Bluetooth 4.0 Power: 3W*2 (6W) Battery: Li-Polymer 3.7V / 2600mAh Working time: 6 Hours Colors: white Material: Metal Size: 9.45inch*3inch Frequency Range: 100HZ--10KHZ 3 Layers material for Noise reduction: Out layer:Broad metal mesh plated Gold Middle layer:Thick metal mesh plated Gold Inner layer:High density Sponge