Spectrum SPMXSEMC02 Firma 85A Brushless Smart ESC & 4000Kv Motor Combo. This is the Spectrum Firma 85A Brushless Smart ESC and 4000Kv Sensorless Motor Combo. Spektrum Firma 85A Smart ESC for surface vehicles is waterproof and delivers power and intelligence all-in-one. Without additional sensors or modules, they feed battery and ESC telemetry data straight to […]