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. Rugged & Weatherproof for Outdoor Activities: Features compact cylinder shape and rubber bumpers, X21 portable Bluetooth speaker caters perfectly to boating, golfing, biking, hiking & camping. IPX6 splashproof, dustproof & shockproof features allow you enjoy music in shower, beach and poolside. True Wireless Stereo Pairing for Awesome Stereo: With a second X21 waterproof wireless speaker you can wirelessly pair 2 speakers to play together for a full left & right channel stereo. Buy 2 X21 speakers to pair them up for booming stereo. Will be great loudspeakers for party. (sold as single speaker) Build to Last : Build-in battery supports up to 10 hours of playtime; portable enough to fit into backpack & bicycle bottle holder; Build-in Hands-free speakerphone mic; Hard EAV Travel Case INCLUDED. X21 outdoor portable speaker comes with features you need to fill your life with joy.