This three-piece wireless speaker set is part of the D20 multi-tool, interchangeable battery system. The versatile and durable D20 20V speaker is designed to connect wirelessly to mobile devices and, when paired, will auto-link to stream music. The speaker also has an auxiliary port for MP3 player compatibility and a USB port for charging mobile devices. The set includes a D20 20V Li-ion battery and a D20 20V Li-ion battery charger, each of which can be used with any of the D20 products. D20 interchangeable battery system allows you to combine one battery with any of the tools within the D20 series.