Advance Communication: Transmit audio sound from cellphone to invisible wireless earpiece for speech and music. Bluetooth 4.1 Technology: Connects transmitter to cellphone for seamless audio transmission. Inductive Technology: Utilizes electromagnetic enlistment to transmit sound to the mini wireless earpiece. Mini Wireless Earpiece: Playback sound through internal micro speaker for clear audio reception. Compatibility: Works with smartphones, Android phones, tablets, kindle, eReaders, and devices with Bluetooth connectivity. Built-in Microphone: Allows for answering phone calls directly from the transmitter. Auto Answer Function: Automatically answers phone calls for convenience. Volume Control: Adjust volume using dedicated keys or through the connected device. Optimum Anatomic Design: Comfortable earpiece design for easy and safe wear. Portable and Convenient: Small earpiece with antenna for easy storage and retrieval.