This is the Rx 4 Cell Dry Battery Holder with the BEC Plug. This is to be used with the Airtronics BEC receiver. Features: 1 Black plastic battery case with 4" wire and connector The connector is a Red BEC, this is a Universal connector sek/3-7-94 NOTE: To clear up some confusion--normally BEC refers to "Battery Eliminator Circuitry." However, the batteries one would normally eliminate are the very ones that will fit in this battery holder. BEC in this case just refers to the shape of the plug. It is a Red two-pin accepting connector. UPDATED 4/2/97 AST ir/le