I used this product in my pools for days without charging it and i plan to go scuba diving with it. It is very easy to use just charge and go. Moderately fast especially when you kick. This is the coolest product I've bought off amazon.Edit: This works great in the ocean as well it will get you moving quickly (surprisingly fast actually) I use it a lot with and without scuba gear to take me over reefs and to explore more. It is effortless and has a long battery life. I defiantly recommend this.