Bar code scanner accessories support and maintain bar code scanners. They include USB cables, charger cables and charging cradles. USB cables are used with modems, which synchronize multiple bar code scanners to one computer. They are also used to power bar code scanners that lack batteries and must be cabled. Charger cables recharge batteries and are compatible with multiple scanner models. Charger cradles consist of an AC power supply, weighted base and cradle that holds and charges the bar code scanner.