Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and Amazon Prime.If you're a seller, Fulfillment by Amazon can help you grow your business. Learn more about the program. The small hole on the cover can balance the pressure inside and outside. Therefore, small amout water leaking is normal. To get a longer shooting distance: 1. Filling up with 90% water to ensure sufficient air pressure inside 2. Shooting in 45 degree Warm Tips: *Not suitable for children under 3 years old. *Do not aim eyes to avoid injury. 1. Suitable for children 5+ years old; 2. Do not aim eyes to avoid injury; 3. For little kids, adult supervision required.