E-Sky 4 CHANNEL LAMA V4 RTF Coaxial Remote Controlled Helicopter (Blue Color) 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. Dual 180 motors makes the LamaV4 powerful and efficient. 800mAh 2-cell Li-Po battery pack is low weight, high power and provides flight durations of 10-15 minutes per charge.