MSAs Passport Personal Alarm is the world's top-selling multigas and single gas detector, with over 50,000 shipped to customers worldwide. Its durability is field-proven in the toughest industries around the globe. As the first gas detector with simplified three-pushbutton operation, the Passport Alarm set the standard for simplicity, and users typically require less training to operate it. The Passport is packed with the features needed to help ensure worker safety. Capable of monitoring up to five gases simultaneously, it is equipped with bright, multidirectional alarm lights and a loud alert horn. The displayfaces the user, allowing hands-free operation when worn on the belt or on a strap around the neck. The Passport Alarm's optional high-efficiency pump is powered by the instrument, which provides audible and visual alerts in the event of flow faults. The pump can be removed to provide diffusion-mode operation. The instrument also records gas exposure readings for up to 12 hours for later retrieval if necessary.