HOBBYTIGER DJI Spark Accessories,Lens Filter Set 6-PackND 4, ND8, ND16, ND32, MCUV, CPL (Blue) Water-proof and dust-proof for all-weather races 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 Multiple protections: Low voltage cut-off protection / Over-heat protection / Throttle signal loss protection / Motor lock-up protection External programming port, easy to connect to the Program Card when setting the ESC