External Flash Battery Pack for Canon 580EX II/580EX/MR-14EX/MT-24X (8*AA/CP-E4)
Model: FB-1 - External power source for higher flash capacity - Supports two group of symmetrical charge system; you can install 8 AA batteries to supply sustaining power - Compatible with genuine Canon CP-E4 battery pack - Built-in thermal protection switch - Designed for Canon 580EX II/580EX/MR-14EX/MT-24X - Cable length: 150cm - Comes with soft nylon case