A top-of-the-line Hobbywing electronic speed controller, specially designed for 3D and 4D indoor aerobatic model aircraft. Features a bidirectional mode for 4D flying, with brake and motor reverse function. Switch-mode BEC provides 5.5 V at 4/6 A. Continuous current rating of 18 A, peak current up to 30 A. Supports 2–4S LiPo batteries. Weight: 11.9 g. Dimensions: 24.6 × 12.8 × 7.5 mm.