Creative Sound Blaster E1 Portable Headphone Amplifier with Integrated Mic and Dual Headphone Jacks for PC and Smartphones Powerful 600 Ohm headphone amplifier supports high performance headphones for a studio-grade listening experience 106db SnR output that is vastly superior in fidelity to standard USB, motherboard, laptop, and standard smart device output High-quality powered headphone splitter lets you share music with a friend with no quality loss Built-in Lithium battery with up to 25 hours of audio playback and fully portable Built-in mono microphone allows users to take calls when connected to smartphones and clear voice communications for games and Skype calls on PCs and Macs SBX Pro Studio audio suite enhances audio for your PC or Mac with award winning virtual surround, bass expansion, and on-the-fly dynamic range improvement Crystal Voice features innovative technologies that are specially designed to deliver the best vocal fidelity on your PC or Mac. Please refer the User Guide before use.