2S and 3S LiPo Compatible Waterproof Design Overview Castle's Sidewinder ESC, the leading 1/10th scale sport brushless ESC, is now waterproof. The new Sidewinder 3 can power crawlers on water filled trails, SCTs through rain soaked parking lots, and AWDs on rips across muddy fields. Drivers can follow their irresistible urges to drive in the mud or stomp their truck in puddles without damaging their controller. Designed for 1/10th The Sidewinder 3 ESC is a great fit for 1/10th off-road, on-road, and rock crawlers running up to 3S LiPo*. It sports updated circuitry for faster response time and improved reliability. As always, the Sidewinder 3 offers industry-leading software functions and USB programming capability via Castle Link USB adapter (sold separately).