The Hobbywing EZrun Series Brushless ESC System is one of the most popular Brushless System in the RC market. If you are still looking for those Brushless ESC Systems (Combo 15-car, Combo 16-car, Combo 17-car & Combo 18-car) please do not worry because it has been updated to a new version – version 2.0 and these brushless system has been given a new item no. as combo-A1, combo-A2, combo-B4 & combo-B5. The old version are exactly the same as the version 2.0, and of course there are more new features on the version 2.0 such as new crawler running mode and USB Supported on the ESC. New programmable functions on the program card. The specification of the version 2.0 brushless system is as well as the version 1.0. No negative but only positive changes on the Ezrun series brushless system by Hobbywing.