Polaroid Bluetooth Stereo Sound System, Three Piece System, Portable & Rechargeable System (Black) Plug the satellite speakers into the master speaker for a fully immersive stereo listening experience, or use the rechargeable master speaker solo. The speaker system emits clear, true-to-life stereo sound when used as a complete set. Connect to smartphones, tablets, and other Bluetooth-enabled devices to enjoy music, podcasts, and more. An aux-in port alternative connects directly to 3.5mm jacks. The micro USB port charges the speakers for hours of uninterrupted use, even without a source of electricity.