From the a.t. guys website:

The Meteor Vibrating Pocket Watch allows you to independently know the current time without disturbing others. It features a simple, three-button design and is especially ideal for persons with hearing loss.

The Meteor indicates time by inaudible and discreet vibrations. It has 3 buttons: The upper button for Hours, the central button for Tens of Minutes, and the last button for Minutes.

Examples:

The buttons may be pressed in any order For example, you can check just the Tens of Minutes and then the Minutes.

Listen to an audio demonstration of the Meteor Pocket Watch