This is the AirSep FreeStyle 5's Internal Battery Replacement. It carries a 1-year warranty and can be replaced by us into your unit, or we can walk you through the process if you are comfortable working on electrical/mechanical devices Physical Characteristics: Size: .75 H x 2.0 W x 5.38 L inches (1.9 x 5.1 x 13.7 cm) Weight: .76 lbs (344.7 g)Caire