Security equipment and supplies help protect commercial and industrial facilities and the people inside them. Access barriers and crowd-control products are used to direct traffic and restrict access to certain areas of a facility. Two-way radios, police scanners, walkie talkies, and vessel automatic identification systems help workers communicate with and listen to each other around the job site. Locks and safes keep valuables secure from theft and damage. Security alarms and warning are used to warn personnel of emergencies or prevent theft and vandalism of a company's property.