20A ESC BLHeli Opto Quad Pack (BLHA1006)

A four-pack of BLHeli Opto 20A electronic speed controllers built for FPV quadcopters, pre-flashed with BLHeli firmware for quick setup and dependable motor control.

Each ESC is opto-isolated (no onboard BEC) and rated for 20A continuous current with a 25A burst, designed for 2-4S LiPo packs. Weighing about 6.8 g each and measuring roughly 24.5 x 12.9 x 5.2 mm, they fit into compact frames. Features include active damping and OneShot support, along with protection such as failsafe, overheat protection, and low voltage cutoff to safeguard motors and battery. Control signals range from 20 to 500 Hz with an 18 kHz PWM frequency, delivering smooth throttle response and reliable performance in fast, agile flights.