Features: 100% brand new and high quality The ESC firmware is BLHELI 14.2 version, but it can be connected through the signal line to flash the firmware to adjust the parameters. It is specially designed for the mini multi-rotor traversing aircraft, and the throttle response speed is fast. Energy-saving design, with good compatibility with common motors; Throttle signal adopts twisted pair cable to reduce crosstalk and more stable signal transmission in flight. Throttle refresh rate, compatible with all flight control systems. Using the new process ultra-low resistance miniature MOSFET, it has the characteristics of high-speed and high-load conductivity. Package Includes: 1x Speed Controller Specifications: Specifications: RW.RC MINI 16A 2-4s Voltage: 6-14.8V (2-4S Lithium Polymer) Output current: 16A BEC: none Signal frequency: 20-499Hz Output PWM frequency: 18KHz Firmware: BLHeli firmware .14.2 version Bootloader: ATMEL Bootloader (ArduinoUSBLinker) Weight: 2.5g (without wires) Weight: 6 grams (including wires) Material:PCB board Size: Approx. 24x13x5mm/0.94x0.51x0.2 inches note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.