Sony GTK-XB90 is a powerful, portable EXTRA BASS Bluetooth speaker featuring a built-in battery, Infinity Mirror lighting effects, and a compact design for parties. Key specs include two 7.09-inch woofers and three 2.36-inch tweeters, offering up to 360W total RMS power. It supports playback via USB and Bluetooth, includes a Mic In port, and can be controlled wirelessly through the Sony | Music Center app and Fiestable app. The battery provides up to 16 hours of playback with lights off and 3 hours at max volume with lights and EXTRA BASS on.