This is a handy toy for kid under age of 12, But I do like to play.
A remote control submarine that equiped with three motors, forward propeller, rudder motor and up/down by big propeller at the bottom.
10 minutes to charge can play for 15 minutes. 10M control distance, real fun for kids. It is Safe as it is charged by 5 large 2A battery cells. I bought it from Ap Liu Street at HKD$300.00
AP Liu Street Snob