Main Features: - High-performance EFM8BB21 50MHz MCU - BLHeli - S does Damped Light, i.e., regenerating braking - Firmware upgradable via signal wire - Supports motors with super high KV ( it can handle up to 500k eRPM ) - Reliable digital signals including DShot600, DShot300, DShot150 - Small and light, only 26 x 14.6 x 1.6mm, 2.2g