Esky&reg; 4 CHANNEL 2.4G 300 Co-Axial Lama V3 RTF RC Helicopter Coaxial, counter-rotating blade rotor design provides incredible stability and positive control. Full RC system set Included, ready to flight out of box. Pre-installed ESKY 8g servos and 4-in-1 control unit. No installation or assembly required. 800mAh 2-cell Li-Po battery pack is low weight, high power and provides flight durations of 10-15 minutes per charge.