Amazon.com: ICQUANZX 4pcs 35A ESC OPTO Electronic Speed Controller 2-6S Brushless for FPV Multicopter Quadcopter : Toys & Games
Amazon.com: Jimi Original ZTW Spider 30A 2-6S LiPo Battery Brushless OPTO ESC Speed Controller with Blheli Firmware for F450 F550 RC Muticopter : Electronics
Amazon.com: Jimi New Favourite Eagle 80A HV-OPTO 5~12S LiPo Battery High Voltage Airplane Brushless ESC with BLHELI Software for RC Multicopter : Electronics
Amazon.com: QWinOut 4Pcs RW.RC V14.2 Version BLHeli Program OPTO Mini 30A ESC Brushless Speed Controller 2-4S for DIY FPV Quadcopter Drone 250 210 : Toys & Games