This is the Transmitter Battery Charge Cord by Hitec.

FEATURES: One charge plug with preinstalled leads. Leads are bare to allow the modeler to attach various connectors to different chargers.

INCLUDES: One charge plug with leads marked positive and negative

REQUIRES: Soldering of appropriate connector

SPECS: Length: 20.25" (510mm)  

BOX DIMENSIONS: 2.25" W. X .38" H. X 3.00" L. BOX WEIGHT: .03 LBS.