17-3/4″ main rotor diameter, 19″ long, 10-1/4″ tall, 15-1/2 oz. flying weight. 25% larger than the Co-Co Lama for greater stability and better performance in light winds. Helicopter can be flown indoors or outdoors. EC-135 is capable of forward flight, good for learning the skills to move up to a collective pitch helicopter. Powered with two 370 series brushed motors, the helicopter has plenty of power and the 2 cell lipo battery will give you approximately 10 minutes of flight time. Everything that is required to fly (less the 8-AA transmitter batteries), is included. Since there is no assembly, all you need to do is charge the flight battery with the included lithium safety charger, install 8-AA cells in the 4-channel 72 MHz transmitter and you are ready to fly. EC-135 includes extensive use of ball link connections for superior control. Includes second set of main rotor blades. The mixing board with gyro and speed controls is separate from the 6-channel 72 MHz radio receiver, giving you the option of changing radios with no additional modifications or using the radio for other projects. The flight battery compartment is easily accessed and changing the flight battery takes only a few seconds. Durable, easy to fly, and ready built.