HOBBYWING QUICRUN WP16BL30 R/C Brushless Motor 30A ESC Speed Controller Water-proof and dust-proof for all-weather races. (Note: please uninstall the cooling fan before using this ESC in water; Clean and dry it soon after the use for avoiding the connectors get rusty.) Proportional brake with 4 steps of maximum brake force adjustment and 8 steps of drag brake force adjustment. 9 steps of acceleration (/punch) adjustment from soft to Very aggressive to fit for different kinds of models, tires and tracks. Multiple protections: Low voltage cut-off protection / Over-heat protection / Throttle signal loss protection / Motor lock-up protection. One-button (the "SET"button on the ESC) to set the ESC, and easy to reset all parameters to the factory default settings. Compatible with the optional device ---- the portable Digital LED Program Card, especially convenient for outdoor use.