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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 your radio in real time all over one connection. Now includes a compatible 4000Kv Firma Brushless Sensorless motor when you purchase the combo Like every component in the Spektrum Smart ecosystem Firma Smart ESCs combine “plug-and-playsimplicity with the ability to communicate with other Smart electronics together creating the best-performing RC system for your vehicle imaginable. Firma Smart ESCs do much more than regulate power. They function like a virtual engineer inside your model providing a direct path to the vital operating data you need to reach peak performance. Firma Smart ESCs give you an extra layer of confidence that your electronics are all operating at their best. With Firma Smart ESCs you’ll be better connected to your vehicle than ever before without installing extra components that all work independently of each other. You won’t need extra wires modules or links. A Firma electronic speed control provides a one-wire solution for obtaining telemetry data such as RPM temperature battery voltage and capacity. Firma ESCs not only gather the data but also send it to your transmitter in real time instead of only storing it for after-run study. You’re able to adjust settings as needed to boost performance on the go. The Firma Smart single-wire telemetry solution has been tested for quality and performance by the best brands in RC. Their verdict Smart technology is both simpler and superior!