EN-1 & SC-15 ESC WITH REVERSE
For use with motors down to 21(EN-1) or 15(SC-15) turns
These ESC (Electronic Speed Controller) are standard in the E10 street car and Sprint 2 Sport. The EN-1 unit can handle any motor with 21 or more turns of wire, while the SC15 can handle any motor with 15 or more, allowing you to fit any "stock" motor, which are typically 23 turns or 27 turns or even mild modified motors with the SC-15.

The digital proportional circuitry provides smooth, precise control in a variety of conditions. Both feature reverse, so it's easy to back out of trouble!
Equipped with a standard stick pack battery connector and "bullet" connectors for the motor, this ESC can easily replace the standard ESC in other RTR cars! The large heatsink dissipates any heat build-up and the external power switch lets you mount these ESC's in just about any position on your electric car or truck!

Fits a wide range of electric vehicles. Suitable for brushed motors as large as 540-size (standard 1/10th scale motors), please check your motor spec before using with either ESC. Full instructions and warranty information included. Not for brushless motor use.
HP340 EN-1 Electronic Speed Control For Motors Down To 21 Turn £21.99
HP341 SC-15 Electronic Speed Control For Motors Down To 15 Turn £26.99
Source : Mirage Racing
http://www.mirageracing.com/news.php?article=710