IPEVO Tubular Wireless Speakers Fully compatible with any Bluetooth-enabled music player: use your player as the remote control! Unique and portable interlocking tube design; 3+3 watt speakers for quality 2-way stereo sound 6 to 8 hours of music enjoyment on a full charge; USB-rechargeable battery Volume and music control functions available on main speaker (depending on MP3 player) Rubber spools on each speaker rotate to wind cords for portability and to avoid clutter