ZIOCOM Zio Wireless CSR Bluetooth4.0 Headset Receiver (with Free Headset) (BLUE) Simple operation, normal headset/speakers become hands-free Bluetooth headset/speaks magically. Automatically connect back functionIf completed Bluetooth pairing for the receiver and your cell phone in first time using, in next time using, just turn on the Bluetooth of the cell phone first, then turn on the Bluetooth receiver, it can be automatically paired. Music or call switching, free and relaxed. When the call comes, short press the function button to answer it in hands-free mode or long press the function button to reject the call. Super clear and flow conversation effect. Inner Li-Battery, longer working time, lower power consumption. Unique noise eliminating technology obtain more pure sound effect than Bluetooth 3.0/2.0 technology solution.You even can not hear any noise at all.Unique acoustic effect enhancing technology make you feel permeability and delicacy treble, fluidity and crisp alto, super powerful bass. Two-link: can connect two Bluetooth devices at the same time.