Divoom Voombox Travel Outdoor Water Resistant Bluetooth Portable Speaker with Microphone for Android Devices - Retail Packaging - Red Wirelessly stream audio to the speaker from any Bluetooth equipped device A passive radiator generates impressive bass for its size Rugged design, splash resistant, built for the outdoors Built-in Li-ion battery provides up to 6-hour of playback time Powerful Built-in microphone for hands-free calls