This is a simple 4 cell AA battery holder. The 5 inch cable is terminated with a standard 5.5x2.1mm, center positive barrel jack connector.
The connector mates with the barrel jack on the Arduino (among a number of other products) allowing you to easily make your project battery powered.
Material: Hard Plastic
Compatible with: 4 PCS AA Batteries (Batteries are not included),ordinary battery output 6V voltage
1x 4 x AA Battery Holder with DC Barrel Jack Connector for Arduino