YO063X Brushless 20A electric speed controller for helicopters. Built-in BEC. Weight: 18g. Size: 32*23*7mm. Standard Current: 20A. Max Current: 25A (10seconds). BEC Output: 2A. Input: 2S-3S Lithium-Battery or 6S-10S Nickel-hydrogen Battery.   Package Details Weight: 22.47 g Size: 11.5*2.3*1 cm Package Includes 1 × Brushless 20A Electric Speed Controller ESC with Built-in BEC for Helicopters