Welcome to our store! 1、SG90 9G micro servo, with a semi-transparent body, it is lightweight and has low noise, high performance. 2、40A ESC has safety arming function, throttle calibration function, and supports multiple programming methods. 3、ESC is compatible with Li-ion batteries, and the time can be changed to suit different brushless motors. 4、Comprehensive protection, low-voltage protection, overheating protection, throttle signal loss protection. 5、Compatible for remote control helicopter, made of high-quality metal and plastic, easy to install, performs well. Item Type: Helicopter Fixed Wing Set Material: Metal + Plastic Color: As Picture Shown Weight: Approx. 180.0g/6.3oz SG90 9G Servo: Length: Approx. 21.5mm/0.8in Width: Approx. 11.8mm/0.5in Height: Approx. 22.7mm/0.9in Weight: 9g/0.3oz No Load Speed: 0.12 seconds / 60 degrees (4.8V) Stall Torque: 1.5-1.7 kg/cm (4.8V-6V) Working Temperature: -30 to +60 degrees Celsius Dead Xone Setting: 5 microseconds Working Voltage: 4.8V-6V 2217 Motor: Length: Approx. 50mm/2.0in Width: Approx. 27.8mm/1.1in Shaft Diameter: Approx. 4mm/0.2in kV: 1100kv 40A ESC: Connector: XT60 Continuous Current: 40A Burst Current: 55A (10S) Power : 2-4 pcs Li-ion batteries (not included) BEC Output: 5V at 3A (Linear Regulator Mode-Linear Mode) Max Speed: 210,000 rpm for a 2-pole motor, 7000 rpm for a 6-pole motor, 35,000 rpm for a 12-pole motor Application: RC Helicopter 1 x Motor 2 x Propeller 2 x Servo 1 x ESC 1 x Motor Base 1 x Motor Mount 6 x Servo Arm 1 x Strap 10 x Screw 2 Row x Propeller Gasket Guaranteed Satisfaction: Customers are our top priority. If you find any problem with the product please contact the seller immediately. We strive to provide satisfactory after-sales service.