Udirc Venom RC Boat - UDI002 2.4GHz Remote Control Boat (Blue), - High Speed, Electric and Includes BONUS BATTERY (*Doubles Racing Time*) This remote control boat comes with an extra battery to double your racing time! Low battery alarm warns you when the RC boat is almost out of power so you know when to head for the shore. Self-righting feature lets you keep your boat in play even if it capsizes. This newest USB-rechargeable electric remote control speed boat from UDIRC will blow the other remote control boats out of the water when it races by at 30 km/hr (18 MPH). The UDI002 is an exciting speed boat to see in action and even more exciting to pilot. It features a rugged ABS anti-tilt hull, and a water-cooled, single-prop powerful 370-size motor that combines style, speed, and affordability. Note: In case the rc boat is not working, please check boat with new set of batteries. Charging battery: Normally, it will take an hour and 30 minutes for a full charge. Please charge the batteries from an outlet rather than a USB port from pc. PC USB ports put out a slower charge. When the USB charger is plugged into a computer, laptop or wall charger the 2 green LED lights on the charger turn on. When the batteries are connected to the charging ports on the charger, the LEDs turn off. When the batteries are fully charged the LED lights turn red. The red LEDs indicate that your batteries are fully charged and ready for use. In case the boat won't turn on when in water, please check the bottom of the boat to see if sensory metal is blocked. Also check to see if the battery is showing as charging. Please ensure that the battery is charged and the sensory metal is not blocked for the boat to work in water.