This is the ideal talking portable alarm for the visually impaired. This talking clock keychain has 1/4 inch tall numbers on LCD display. Simply touch a button and a chime sounds and the time is spoken. Alarm sounds as a beep. Touch a single button to silence alarm, or if not silenced by user, the talking clock turns itself off after one minute. You can also set an hourly time announcement, or turn this feature off whenever you want. IMPORTANT NOTE: - This talking key chain/clock is equipped with a Power Saving Mode to preserve battery life. In order to use the clock when you first receive it, it will be necessary to turn off Power Saving Mode, a simple process that is done as indicated below. Product dimensions (imperial): 0.625 inch H x 2.75 inch L x 1.625 inch W Product dimensions (metric): 15.88 mm H x 69.85 mm L x 41.28 mm W