4pcs Rw.Rc 16A/20A/30A Mini BLHeli 14.2 OPTO Mini 2-4s ESC Motion Controllers The long legs are positive

The long legs are positive and the short legs are negative

Runs BLHELI32 firmware

4~35V (suggest 3S battery)

Optical flow and ultrasonic positioning: The combination of precise location by the vision position system and position hold by the optical flow positioning brings on a stable hovering for aerial shooting

Power supply for the fan is not included

4pcs Rw.Rc 16A/20A/30A Mini BLHeli 14.2 OPTO Mini 2-4s ESC Motion Controllers The long legs are positiveSpecifications: Material: Rubber Tool Supplies: ESC Remote Control Peripherals Devices: ESC Use: Vehicles & Remote Control Toys Four wheel Drive Attributes: Motors Technical parameters: Value 2 For Vehicle Type: Airplanes Upgrade Parts Accessories: ESC RC Parts & Accs: Engines Type: Helicopter Power Source: Electric Radio Control Style: RC Model