This is the Furitek Cyclos 20A Sensored Brushless ESC with Black Aluminum Case and Bluetooth Module. The Cyclos is an extremely flexible ESC capable of handling both brushed and brushless sensored motors. This aluminum case version offers increased heat dissipation along with added durability and excellent looks. Designed to handle Furitek Hellfire sensored motors this ESC provides the ultimate in smooth power delivery you expect in a high end race oriented ESC. Overall the Cyclos provides stable and powerful torque, low noise, high efficiency, and offers high-speed dynamic response. For users looking for telemetry, the Cyclos has you covered. When paired with the bluetooth module (or purchased together as a combo), users can see telemetry data on both Apple and Android devices via the FuriCar app.