The ROCKBOX BOLD M is ready for anything! It's small enough to fit in any backpack or suitcase, making it easy to take anywhere. The ROCKBOX BOLD M is beach-proof. Dirt is no problem either: you can simply rinse the BOLD under running water. With the built-in power bank, you can also charge your smartphone or tablet via USB. The ROCKBOX BOLD M features a sturdy rubber label. When you turn on your ROCKBOX BOLD M, the buttons light up, so you know when it needs to be charged to be ready for the next party. The ROCKBOX BOLD M boasts sleek curves and is available in four trendy colors for any occasion. It is wrapped in a durable, waterproof fabric, so you don't have to worry if some sand, dust, or dirt gets on your new speaker. BOLD comes with a built-in microphone, allowing you to call all your friends and invite them to your next party. Bluetooth, wireless, listen to music wirelessly from any Bluetooth device. The water column meets the IPX7 standard. Connect two ROCKBOX BOLD M speakers for stereo sound. It has backup battery functionality and a USB port for charging your mobile phone. Enjoy 15 hours of non-stop music with a rechargeable 5000 mAh battery.