Re-Fuel combines a water bottle with a Bluetooth speaker, making it the perfect accessory for hikers, cyclists, athletes or anyone who enjoys outdoor activity. You no longer need to make space for one thing or another in your bag, or carry the two must-have items separately. The speaker gives you 4 hours of playtime on a single charge. Control buttons are located at the bottom of the bottle. Bottle capacity is 12 oz, it is BPA-free and available in three colors.