This is the T-Rex 250 Electric Micro Helicopter from Align! Align is acknowledged by modelers around the world as the undisputed leader when it comes to advancing high-performance electric helicopter technology. The T-Rex 250 is just one more product of this relentless innovation. This version of the T-Rex 250 kit includes not only the ESC and motor, but also three digitial micro servos for the swash plate control as well as a micro tail gyro and tail servo! All you need to provide are the receiver and battery. Features: Electric Power System Simple and lightweight design provides awesome flight performance and extreme 3D capability Rigid carbon fiber frame design Direct-to-swash CCPM linkages Beautiful factory painted fiberglass canopy 3.5mm main shaft 2.5mm Feathering Shaft 8.5mm Tail boom Center of Gravity of battery tray designed close to the rotor head Belt-driven tail rotor system Kit Includes: T-Rex 250 Kit 205mm Main Rotor Blades RCE-BL15X 15A Brushless ESC 250L Brushless Motor 3x DS410 digital metal gear servos! GP700 Head Lock Gyro DS420 digital tail servo Specifications: Length: 430mm Height: 187mm Main Blade Length: 205mm Main Rotor Diameter: 460mm Tail Rotor Diameter: 108mm Motor Pinion Gear: 14T/15T Main Drive Gear: 120T Tail Drive Gear: 28T Drive Gear Ratio: 1:9.23:4.28/1:8:4.28 Weight (w/o Power System): 138g Flying Weight: Approx. 330g