SPA Tool Digital Clock Desk Clock Led Clock Wooden Clock New Modern Wooden Cube Mini Black Wood Super Soft Night Light White LED Calendar Thermometer Sound Activated Desktop Digital Alarm Clock Two modes: (1)alternately display time and temperature; (2)show time all the time. Can select 12/24 hour format by pressing "UP" or "DOWN" button after pressing "SET" for about 3 seconds. Can set up 3 groups of alarm every day, alarm clock with "beep" lasting for about 1 minute. Powered by DC6V USB or 4pcs AAA batteries, built-in battery for keeping clock running but invisible outside Can change the temperature unit between and by pressing "UP" button in the temperature mode