Stunning Audio With Rich Bass: With dual passive radiators and Digital Signal Processor, X21 Portable Wireless Speaker pumps out rich bass, astonishing crystal clear sound and enhances clarity of mids and highs without distortion at any volume. Super Handy & Multifunctional: Built-in FM radio stays tuned on the go; Bluetooth 4.2 (100 feet range) , AUX jack & Micro-SD card slot provide wide compatibility from phone, tablet, smartwatch to laptop, and MP3 player. A great portable wireless speaker with FM radio for home, travel or outdoor sports.