The Mtroniks Viper Marine 15 Amp Waterproof Boat ESC Speed Control is a high-quality electronic speed controller designed for electric-powered RC vehicles, specifically for helicopters. Made by the reputable brand Mtroniks, this ESC is equipped with a fail-safe feature for added security. With a compatible scale of 1:5 and a waterproof design, this product is ideal for marine environments. Made in China, this ESC is a reliable choice for hobbyists and RC enthusiasts looking for precise control and durability in their vehicles. Check my feedback and bid with confidence. Thank you.