Rechargeable Bluetooth v3.0 Mini Hands-Free AUX Receiver with Built-in Microphone is only $9.99 with Free Shipping. Make your current vehicle or home stereo system bluetooth compatible with the simple addition of this Rechargeable Bluetooth Receiver. Complete with a built-in microphone, you can also take hands-free calls in your vehicle in addition to wirelessly streaming music on your stereo from your handheld device.