JBL Control X Wireless 5.25" Portable Stereo Bluetooth Speakers - Pair (Graphite) Battery-powered stereo Bluetooth speakers without the wires 30W Class-D digital amplification High Definition Imaging (HDI) waveguide with 1 (25mm) CMMD Lite tweeter 5.25" (133mm) polypropylene graphite-filled cone woofer Rugged, contemporary design for indoors or on-the-go