This is a 4 "AA" Cell Receiver Battery Holder by Airtronics. FEATURES: Black Plastic Blue Z Connector INCLUDES: One 4 Cell Dry Receiver Battery Holder REQUIRES: Nothing SPECS: Length: 57.2mm (2.25") Width: 30.2mm (1.1875") Height: 28.6mm (1.125") COMMENTS: This has the Z connector jmm 2/3/02 ir/kh