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.