Key Features: ULR: Ultra Low Resistance Design Specifically Designed for Spec and Stock Racing QuickTune One Touch Programming Adjustable Throttle and Brake Frequencies * High Voltage Programmable BEC * HotWire Programming Port * Data Logging Capability * Sensor Checker On-Board Temperature Indicator ESC Self Diagnostics with Error Codes Fully Proportional Forward/Brake/Reverse Brushless and Brushed Motor Drive Sensored or Sensorless Operation LiPo Safe with Custom Voltage Cutoffs Sensor Plug for Precise Commutation Lightweight Chassis Design HDAC: High Density Copper PCB's Ultra-smooth and Precise Throttle and Braking Control *requires HotWire sold separately Overview: The RS PRO is back! This RS PRO Black Edition utilizes both hardware and software advances recently developed for our latest ESC lineup. With its industry-leading Ultra Low Resistance you can be sure that your motor is getting all the power you can give it. More power, smooth control and reliability you can count on: the RS PRO Black Edition is engineered for performance. Capabilities such as Data Logging and HotWire 3.0 Bluetooth Connectivity allow you fine tune your system and gain an advantage over the competition. The RS PRO Black Edition was specifically designed for 1S-2S Spec Classes and Drag Racing to take full advantage of the ULR circuit design. ULR FlexWire is included with every Black Edition ESC. Pair the RS PROs with a SPEC-R motor for the ultimate Ultra Low Resistance system. For 1/10 scale 2WD/4WD Buggy and Stadium Truck and Modified Touring Car we recommend the RSX Modified ESC as these setups tend to run at higher temperatures. The billet housing and fan shroud on the RSX provide sufficient cooling