To make the clock always display the time, please DOUBLE press the DOWN button to get it into stard mode. Set the value to --:sd to turn off the sound control mode. USB outlet powered is recommended f daily use. Batteries are f back-up travel use. With the LED bulbs, the digital clock consumes me power drains out the batteries within a week. Multiple FunctionsEnergy-saving mode The led alarm clock can be smartly waked up by sound-activated touched. F example, You can light up the display by clapping your hs ( any sound louder than 60dbm) by tapping the clock. If you'd like the clock to stay on, please press DOWN button to turn off the energy-saving mode when displays "--:sd".Time memy function When the power cuts out, the built-in cell can still preserve the time settings alarm settings. 2 Time Temperature display fmat The wood digital alarm clock suppts 12 24 Hours selectable time display fmat temperature display fmat. Choose what you like Safety 2 Power Supplies The cube alarm clock can be powered by USB cable 3 AAA batteries(not include). The DC-USB supply is recommended f environment-friendly stable(batteries could run out of juice); but the it can be a battery operated travel alarm clock as well Specifications: LED Light Col: White Power Supply: USB cable AAA batteries (not included) Net weight: 3.6oz Product dimension: 2.522.442.52in Shipping weight: 5.2oz Package dimension: 3.153.153.54in USB cable: 3.28ftPackage Contents 1 Digital Wooden Alarm Clock 1 USB Cable 1 User Manual