This rugged outdoor backpack speaker combines waterproof and shockproof durability with Bluetooth 5.3 for reliable wireless connectivity up to 20 meters. Lightweight and compact, it easily attaches to your bike with a clamp, delivering clear stereo sound powered by a rechargeable 500mAh battery for up to 4 hours of playback. Featuring a built-in microphone for hands-free calls and versatile audio input options including TF card and USB flash drive, it’s the perfect companion for camping, biking, or any active adventure. Enjoy your music anywhere with this tough, portable speaker.