The SXX TC-Spec version 2 represents the best technology of today's top-of-the-line speed controls! Together with the awesome power of the X-12L Short Course 550, these combos promise to boost the power and drivability of your 4x4 short-course truck to the next level! SXX Competition V.2 Speed Control Features: * Dual ADPC max Software: Independent adjustment of "Feel" and "Boost" for maximum flexibility. * USB Software Updateability: Benefit from all the latest performance improvements and updates available. * Twin BEC: Constant 6V/3A output with 3.0V to 7.4V batteries. No receiver battery with 1S LiPo needed. * Revolutionary Internal Temp Check System 3: Allows you to read out the maximum internal temperature for each the speedo and motor. * AutoCell System 2 (3.0V to 7.4V input voltage): Fully adjustable cut-off system for all types of cells. * C3 Technology: Revolutionary Copper Core Cooling technology for lowest-running temperature Vector X-12L Features: * 550 Size: 75% longer magnet and stack for high power and torque * HDS Technology: High-density stack for power-hungry 4x4 Short Course trucks * PreciSensor System: Revolutionary precise sensor positioning for great power, efficiency, and throttle feel * 5mm output shaft * Re-buildable * Easy solder tabs * RPM 26640 * Weight 240g * KV 3700 * Power 695W * Diameter 35.8mm * Length 66.0mm ESC Specifications: Motor Limit: 4.5T or higher Voltage Input: 3.