Waterproof ABS plastic parts are durable and smooth. Exquisite workmanship, mini and lightweight. Its cool and exquisite appearance gives you a vivid feel for the real submarine. You can't see if the submarine has electricity. When you get the submarine, you put it in the water. Its lights will turn on. It is charged very quickly. You can't see if it's charging or not. Charging is the same as usual. When it touches water, it will start normally. It's not broken. There are two led lights in the front which are very visible in the dark, So you know where the sub is underwater. There are two rubber drain plugs in case you get water inside the body of the boat. The submarine has two metal joints on its head to protect it. When it touches water, it gets electricity, and when it leaves water, it loses power. It just needs to start in water. Charges with computer not plug (Plugs burn out built-in batteries easily). Perfect size for pools, small ponds, fishpond, rivers and lake. It can be used as a indoor as well as outdoor toy. Great for outdoor and indoor entertainment. It is the best gift for kids, boys, girls and adult! It could help them thinking and coordinating their brain and hands together. It can exercise children's hand-eye coordination and flexibility.