To make the clock always display the time, please DOUBLE press the DOWN button to get it into standard mode. Set the value to --:sd to turn off the sound control mode. USB outlet powered is recommended for daily use. Batteries are for back-up or travel use. With the LED bulbs, the digital clock consumes more power and drains out the batteries within a week. Multiple FunctionsEnergy-saving mode The led alarm clock can be smartly waked up by sound-activated or touched. For example, You can light up the display by clapping your hands ( or any sound louder than 60dbm) or 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 memory function When the power cuts out, the built-in cell can still preserve the time settings and alarm settings. 2 Time and Temperature display format The wood digital alarm clock supports 12 or 24 Hours selectable time display format and and temperature display format. Choose what you like Safety 2 Power Supplies The cube alarm clock can be powered by USB cable or 3 AAA batteries(not include). The DC-USB supply is recommended for environment-friendly and stable(batteries could run out of juice); but the it can be a battery operated travel alarm clock as well Specifications: LED Light Color: White Power Supply: USB cable or AAA batteries (not included) Net weight: 3.6oz Product dimension: 2.52*2.44*2.52in Shipping weight: 5.2oz Package dimension: 3.15*3.15*3.54in USB cable: 3.28ftPackage Contents 1 Digital Wooden Alarm Clock 1 USB Cable 1 User Manual