This veritable little robot opens jars without any effort required! Simply position the can opener over the jar, press the button and release. Automatically adapts to fit the jar and stops when the lid is open. Ergonomic shape is convenient for single-handed use (right or left handed). Plastic and metal. Dims 18.6 x 9.1 x 6.8 cm approx. Requires 2 AA batteries (not included).