Marshall Kilburn Portable Bluetooth Speaker, Black (4091189) Unrestrained and portable active stereo speaker Free from the confines of wires and chords.Channel Frequency Response: 62 - 20000 Hz Maximum sound pressure level is 100 dB at 1 meter 20 hours of portable capabilities Cabinet principle: bass reflex Double-ended coil cord with 3.5mm stereo plugs included 3/4" dome tweeters: 2X; 4" woofer: 1X