Bluetooth Technology: Wireless 4.0 technology ensures transmitting strong signal in high quality and high speed. Transmission distance is up to 10m / 33ft, free to enjoy wireless music. BT Audio Transmitter: Can be connected to the audio devices(such as MP3, MP4, TV and PC, etc.) without Bluetooth function, changing them into BT-enabled ones, and making it work with BT-enabled Headset and Speaker. Powered By USB: With USB plug, you can plug and play this transmitter easily and no need any other driver software, powered by USB, there is also no time limited. Perfect Sound Effect: Adopts Advanced Bluetooth Module which lets it get the high-quality sound effect with A2DP. You can enjoy music, watch movies and play games without disturbing others. Designs: The Bluetooth Transmitter is specially designed for theAudio Devices (such as MP3, MP4, TV, PC and DVD, etc.) without Bluetooth function. After connecting with them via a 3.5mm audio cable or RCA cable, it can transmit the audio files of them to the Bluetooth-enabled Receiver devices(such as Headset, Speaker, Bluetooth Receiver, etc.).