Hornet Electronics TM, BAT Crystal Clear Sound Stereo Bluetooth Headset, With a 3D-axis folding design, Plus answer calls. 1.) Foldable Bluetooth headset works with most Bluetooth enabled devices 2.) Built in microphone for hands-free phone calls and with Built-in 400 mah rechargeable polymer battery 3.) Volume +/- control 4.) Previous track/next track control 5.) With AUX input function to work with non-Bluetooth devices