Big, clear sound with fuller bass - Dual precision stereo drivers deliver balanced mids and crisp highs, while 14W of power, digital audio processing, and a passive bass radiator produce strong volume and fuller bass. Up to 100-foot Bluetooth range - Bluetooth 5.4 and advanced antenna technology provide a reliable wireless connection from up to 100 unobstructed feet away. Connects with smartphones, tablets, computers, and compatible Echo devices. Two-speaker wireless pairing - Connect two OontZ Cylinder speakers for left- and right-channel stereo separation, or set both speakers to play full stereo in different areas. Second speaker sold separately. IPX7 waterproof protection - Built to withstand rain, splashes, and temporary immersion in up to 1 meter of water for up to 30 minutes. Suitable for the pool, beach, camping, and outdoor use. Up to 20 hours of playtime - Enjoy up to 20 hours of listening on a single charge. The built-in microphone supports hands-free calls. Measures 8 by 3 by 4 inches and includes a USB-C charging cable.