UDI U830 2.4Ghz 4 Channel 6 Axis Mini Remote Control Helicopter with Gravity Sensor. Beautiful durable sleek design with impact shock proof safe. 2.4Ghz mini 4 channel 6 axis hand sensor quadcopter with gyro stabilization with gravity sensor. UDIRC U830 RC quadcopter can follow the direction of the hand sensor controller. Buy this Toy and Get 46% Off for Mini Remote Control Helicopter with Gravity Sensor. Free Shipping!