Specification: (1) main rotor diameter: 340mm; (2) weight: 230g; (3) length: 408mm, width: 85mm, height: 180mm; (4) power system: 180 motor*2; (5) kit/arf/rtf: rtf; (6) transmitter: standard 4 ch; (7) mix controller: 4 in 1 controller(w/gyro, mixer, esc, receiver); (8) servo: 8g, 1.3kg. Cm, 0.12s/60 degree; (9) battery: 7.4v 800mah li-polymer battery; product introduction: lama v4 is a kind of helicopters with new design idea remote-control skill. Its power adopts coaxial counter-rotating blades and dual-motor system. The "4 in 1" mix controller integrates the functions of gyro, mixer, esc and receiver. The canopy can disassemble and install easily so as ot adjust and mend the helicopter conveniently. It is also pretty and practical. Lama v4 possess of stable and precise flight capability. The installation of two esky 8g servo provides a very smart and prompt reaction to the helicopter. So that the helicopter can hang in the air and do various direction flight easily. 7.4 li-polymer battery extends its flying time. We believe that lama v4 can be the best choice for beginner and the best entertainment for flying master. It will bring infinite happiness to you and your friends. Lets enjoy the happy flying and beyond your dream. Product features: (1) coaxial, counter-rotating blade rotor design provides incredible stability and positive control. (2) full rc system set included, ready to flight out of box. (3) pre-installed esky 8g servos and 4-in-1 control unit. (4) no installation or assembly required. (5) dual 180 motors makes the lamav4 powerful and efficient. (6) 800mah 2-cell li-po battery pack is low weight, high power and provides flight durations of 10-15 minutes per charge. Payment method: visa, moneybookers, western union, t/t shipping by ems welcome to contact us if have any question.