This is the 4 Cell AA Battery Holder for use with the Tower Hobbies 224 System 2.4 System. FEATURES: Nylon construction Black in color INCLUDES: One 4 Cell AA Battery Holder with connector SPECS: Length: 58mm (2.3") Width: 32mm (1.3") Height: 30mm (1.2") cnh 7/29/09 ir/jxs