Disco balls that just light up are so 1970's. Built for the 21st century, this model has on-board speakers, so it not only fills your room with a rainbow of changing lights, it fills it with great sound too! Plus, it's compatible with all of today's latest audio technologies. It can play music from USB sticks and micro SD cards and has Bluetooth technology for streaming music from your smartphone, MP3 player or tablet! 7.5" diameter globe. 1-year limited warranty.