Check the listing for details. Spektrum Accessories FIRMA 2 in 1 - 40A BR Smart ESC/Dual Protocol RX. Condition: New. Listed at 84.99 USD. Features Dual Protocol – SLT and DSMR Compatible Smart all-in-one telemetry Fast, powerful 32-bit ARM M4 Processor Waterproof Multiple Programming Options Multi-point protection Overview Upgrade your brushed motor equipped vehicles to Spektrum™ Smart Technology! Feature-packed Firma 2-in1 Smart ESC/Receivers deliver power and intelligence all-in-one, with no additional vehicle modules or links required. Get valuable telemetry data easily and in real time right on your Smart-compatible Spektrum transmitter- including battery voltage, current, ESC temp, and battery data (when using a Spektrum Smart battery). This data will help with increased efficiency and extend battery life and run time. The Firma 40 Amp ESC also helps reduce clutter and.