EMAX BLHeli lightning 20A ESC Micro Mini Electronic Speed Controller Only 5g for Racing Drone  Description: Brand Name: Emax Item Name: 20A BLHeli lightning ESC Input Voltage: 3-4S BEC: No. MCU: F396 Weight: about 5.5g(includes wires) SizeL 24.5x12.5x5mm     Features: The first BLHeli ESC with Synchronous Rectification hardware design in the market Utilizes high-performance F396 MCU Supports active braking FW upgradable via signal wire Anti-counterfeit code of authenticity Smallest F396 powered 20A ESC in it's class Oneshot Enabled \/ Multishot Ready High-current burst rating     Package Inlcuded: 1 x ESC