4D r/c butterfly helicopter with Gyro 500mA 3.7vrechargeable battery flying time:8-10minutes outdoor and indoor flying 2.4Ghz remote control four-axis aircraft6 channel ladybird r/c helicopter with 4axis gyro450mA 3.7v rechargeable batteryflying time:8-10minuteseasy to flyfrequency:2.4Ghzcharging time:45minutesstable,flexible,flight routes,drift,3D to roll over easily 4D rc flying ladybird