The Talking Travel Alarm Clock, model AIC20T, is a voice output alarm clock designed for use by individuals who are blind or have low vision. This portable clock speaks in a female voice when each button is pressed. Features include 12 or 24 hour cycle, hourly time announcements, alarm. This clock is good for travel as it is about the size of a credit card and features sliding panel that covers the controls and battery. POWER: uses a long-life lithium battery. DIMENSIONS (HxWxD): 3.75 x 2.5 x .75 inches.