2 Pack AAAA, carded Chemistry: Alkaline-Manganese Dioxide (Zn/MnO2) Voltage: 1.5 Capacity: 550mAh Measurements: 2" x 0.4" (50.80mm x 10.16mm) Additional Model #'s 1000-UL2AAAA UL2AAAA ULA2AAAA UPC: 076097108653