Flysocks Digital Alarm Clock, [Upgrade] Bedside Non Ticking Alarm Clocks with USB Cable, Snooze, Large LED Display, Adjustable Brightness

OverviewPower Saving Mode: This Digital Alarm Clock will automatically switch to power saving mode when powered by 3 AAA batteries (not included). It won't disturb your sleep since the clock doesn't illuminate at night unless you wake it up (Any sound over 60dB nearby). USB Power Supply: Only when the clock is connected to a power source with the USB cable (included) or a DC adapter (not included) will current local time be displayed without interruption. You can plug into the mains to keep the screen on.