Introducing the BOOMER Wireless Bluetooth Speaker Bottle. Play your favorite music on-the-go. Water resistant. Compatible with IOS, Android, Phones and Tablets. Microphone for answering phone calls. Call back feature to last caller. 4 hour battery life on normal volume. Micro-USB port for fast & easy charging. Speaker built-in to lid. Made with double wall vacuum sealed stainless steel. Keeps liquid cold for 24 hours and hot for 12 hours.