SPEDIX LS40 Slim 40A 3-6S Blheli_32 M4-32bit F4 Core Brushless ESC for RC Drone FPV Racing Specification: Brand name:SPEDIXItem name:LS40 Slim 40A Brushless ESCInput Voltage: 3-6 S Max. Continuous Current: 40 A Burst Current (10 Sec.): 50ABEC: No Current Detection: No Firmware: BLHeli_32 Integrated RGB LEDDimensions: 9x 38x 6mm Weight: 7.5g Feature: Equipped with the latest STM32L4 chip (F4 Core) & BLHeli_32 firmware, LS40A has the fastest response speed compare to any other similar products in the market. Ultra-slim design. LS40A fits narrower arms of modern racing drones guaranteeing a clean build. Powered by full-size 40V MOSFET to ensure extreme reliability. Customized aluminum heat sinkfor enhanced cooling & impact resistance. Intergrated RGB LED support multiple color settings. Package Included:1 x LS40 Slim 40A Brushless ESC1 x Heat Shrink