This speed controller is designed to control brushless motors with rotating case, but specifically motor EM 300/20 (optimal for Hornet II and Hornet X 3D).

Features:
Weight: 12 g
Measures: 40 x 24 x 9 mm
Current: 8A
BEC: 3-4 servos
Cells NiXX/LiXX: 6-10/2-3