TMN-9BTis a 2.1 multimedia speaker system with Bluetooth and SD/USB input. Bluetooth 4.0 wireless technology allows high quality music streaming. SD/USB inputs support various audio formats like MP3, WAV, etc. The slope design of front panels makes low diffraction effects which broaden the sound transmission range. The 5.25″ woofer and 3″ tweeter feature full spectrum performance. The wooden cabinet is the plus addition to the incredible X-bass and crystal clear vocal sound. Its stunning acoustic performance is mostly perfect for heavy metal music.