- Made from safe materials: BPA-free drinking water dispenser, silicone hose, durable 304 stainless steel, and high-density ABS plastic. No toxic substances or odor. Equipped with USB charging for quick and convenient use—just press a button to dispense water instantly. - Wide compatibility: Designed to fit 2.16-inch (5.5cm) neck gallon barrels without removing the lid. Works with various bottle sizes, including 4.5L, 5L, 7.5L, 10L, 11.3L, 15L, and 18.9L. Not suitable for threaded or screw-top bottles; please check your bottle neck size prior to purchase. - USB rechargeable: Features a built-in 1200mAh battery, providing 30-40 days of use or about 4-6 five-gallon water bottles on a full charge. Perfect for daily hydration needs or outdoor adventures, eliminating the need to lift or flip heavy bottles. - Simple operation: Easily attach the dispenser to the bottle opening and operate with a single automatic switch. User-friendly design makes it hassle-free to use, even for children and seniors. - Versatile application: Ideal for picnics, home use, kitchens, offices, and outdoor activities. Its convenient, portable design ensures easy access to water wherever you go.