This is the Switch Harness for Futaba Radios with J style connectors. The switch harness connects the receiver battery to the receiver by way of an ON/OFF switch. It also allows you to charge the receiver battery without removing it from the model. One Switch Harness w/ J Connectors and Charge Cord. To mount the charge cord and ON/OFF switch into the side of the airplane for recharging, use GPMM1000. pcd 3/17/94 ir/jl &