Phoenix Edge Series ESCs are the next evolution in speed controller technology. The white user-programmable auxiliary wire can be used for features such as helicopter governor gain input adjustments mid-flight, serving as an audible beacon after an “unexpected landing”, acting as an RPM output for 3-axis gyros that support RPM sensors, be used as an ESC arming lock (coupon for free Arming Lockout Key included), or as a receiver arming lock. Combined with data logging, access to Castle’s industry leading software functions, and USB programming capability via Castle Link USB adapter (coupon included), Phoenix Edge offers unparalleled versatility.