This is the Eagle Tree Guardian 2D/3D Inertial Stabilizer for Model Airplanes. FEATURES: Smooths out air turbulence and provides true wing leveling capability to help recover from lost orientation 2D flight mode helps beginning pilots return model to level flight when needed, and helps compensate for windy conditions, imbalance, poor aerodynamics, or high motor torque 3D flight mode makes control snappier for precision manuevers and has two submodes for 3D flying; In 3D Heading Lock submode the Guardian locks onto the present attitude (pitch, roll, and heading) allowing easier stunt performance In 3D Gyro submode the Guardian uses its built-in 3 axis gyro to increase model"s stability, reducing effects of gusts, turbulence, motor torque, and other factors May be tuned with a small screwdriver or set up on a PC with a USB cable (not included) Small size installs in fuselage and connects between receiver and servos-no additional sensors or hardware to install INCLUDES: Guardian 2D/3D Inertial Stabilizer with Instructions and Connectors for your Receiver and Servos SPECS: Input Voltage Range: 4.5-16V Current Draw: Approximately 31mA Dimensions: 1.62 x 0.86 x0.42" (41 x 22 x 11mm) Weight: 0.4oz (11g) including harness Maximum Servo Current Capability: 5A jxs 10/25/12 ir/jxs updt jxs 01/10/13