The Travel Sentry® Approved locks are recognised and accepted by the Transport Security Administration ( T S A) in all U S commercial airports. The Travel Sentry® logo alerts T S A agents that they can open your lock and relock it using codes and secured tools during inspection. A colour signal is used to indicate whether the lock has been opened by T S A Agents during inspection. Travel Sentry® Approved Combination padlock for luggage zippers3-dial ressettable combination Display window shows whether lock has been opened by T S A agents during inspection Zinc alloy