... Bluetooth stereo speaker with charging dock 2.TWINS design, left and right channel make you more enjoy music Key specifications:Bluetooth specification: Bluetooth ... sensitivity: 800mVRechargeable 2100mAH Li-polymer batteryWorking time: One speaker: About 16 hours Two speakers used together: ... other furnitures.Wirelessly plays your favorite music from your Bluetooth A2DP device, MP3/MP4 player, PC, etc ...