The Axess Portable Bluetooth 2.1 Hi-Fi Cylinder Speaker in Blue features a 4-inch (101.6mm) Subwoofer and 2-inch (50.8mm) Horn. With A2DP Stereo Bluetooth, wirelessly stream music from any Bluetooth-enabled device such as your mobile phone, notebook, or other portable audio device. With Aux Line-in function, this speaker is suitable for PC, MID, TV and other audio device.