The Mamba Micro X2 is a refresh of Castle's popular 1:18 scale Mamba Micro X. This new ESC increases the maximum input voltage to 4s. Castle also added DATA LOGGING and CRYO-DRIVE TECHNOLOGY, CryoDrive allows the ESC to run cooler and more efficiently at partial throttle. Like its predecessor, it boasts an 2 amp peak BEC, waterproof and has SENSORED MOTOR SUPPORT. This is the perfect upgrade for 1:18th scale 2WD or 4WD vehicles up to 2.25 lbs. The Mamba Micro X also works well in some 1:10th scale crawlers for low speed operation (no rock racing/hill climbing). You can now purchase the Mamba Micro X2 Crawler Edition ESC paired with Castle's Slate Crawler motors. Features Sensored Motor capable Convenient transmitter programming for six common adjustable settingsSpecifications Length: 1.5 inch Voltage: 16.8 V - SKU: HRPDS43032