Features: 1. FlyDragon Lite series, compact and lightweight. 2. Unique circuit design with strong anti-interference. 3. Start mode can be set, throttle response is fast with smooth speed regulation linear. 4. Low voltage protection threshold value can be set. 5. Multiple protection: startup protection, over-heat protection, throttle signal loss protection, low-voltage cut off protection etc. 6. Good power safety performance: wherever the throttle lever is, the motor will not start immediately. 7. Judge the working condition via the alarm after power on. 8. Cycle programming menu setting, easy to operate. Users can set functions according to their demands. 9. Built-in BEC, high output power, less power loss. Specification: Condition: 100% Brand New Item Type: RC Accessory Material: PCB Color: As Shown in the Picture Weight: Approx. 33-54g Applicable Product: for RC Multi-rotor Aircraft Optional Type: 20A, 30A, 40A, 50A Details: Constant Current Instantaneous Current (10s) BEC Voltage Size 20A 30A 5V / 2A 2-4S 49 * 25.5 * 10.5mm / 1.93 * 1.0 * 0.41inch 30A 40A 5V / 2A 2-4S 49 * 25.5 * 10.5mm / 1.93 * 1.0 * 0.41inch 40A 50A 5V / 3A 2-4S 65 * 26 * 15.5mm / 2.56 * 1.02 * 0.61inch 50A 60A 5V / 3A 2-4S 65 * 26 * 15.5mm / 2.56 * 1.02 * 0.61inch Package List: 1 * ESC 1 * Manual