Konigswerk New Wooden Series Modern Mini Rectangle Wood Grain Calendar Thermometer Activated Desk Super Soft Night Light LED Digital Alarm Clock (Black-White) AC023G Modern MINI Rectangular Wood Grain Thermometer Touch Sound Activated Desk LED Digital Alarm Clock (Powered by: AAA Battery / USB / DC) (AAA battery not included) Display can be set to be Sound activated. Sound activated mode display will turn off after 15 seconds (Clock's still working). You clap hands/make a sound/simply touch the clock to activate the display to read time. AAA batteries and USB/DC power supply can be used simultaneously, and batteries act as a backup. If LED display keeps ON and only powered by batteries, battery is easy to waste (Works around 3 days). Please use the USB cable replaces the batteries to charge your clock. Fashionable and portable digital desktop alarm clock for home & office Clear LED Display: Time (12/24 hrs) and Temperature ( C/ F)