Bedside alarm with loaded features including bright multi-color LED with large time digits and brightness control. View current room temperature (F/C) & humidity and their trends. Featured icons include moon phase, web connection, and low/weak battery indicator. AC adapter included for USB charging port to refill battery power in smartphone or other Mobile device. TROUBLESHOOTING STEPS: 1. Insert the 5.0 volt power cord into an outlet, then into your clock. Optional: Install 2-AAA batteries into your clock. 2. Use settings menu to program your clock. The backlight is adjustable – ADJUSTABLE BACKLIGHT • Power Cord: Press LIGHT HI-LOW-OFF button to adjust backlight. • Batteries only: (please ensure using batteries dated 2026 or newer) Press the LIGHT HI-LOW-OFF button for a 10 second backlight. Also, if to Manual WWVB Atomic Time Search • Hold the – button to start or stop a WWVB signal search. • WWVB Icon will flash when searching. ATOMIC SIGNAL SEARCH: The LCD backlight and USB charging port will momentarily turn off while the station searches for the atomic signal. The alarm clock will start searching at UTC 7:00, 8:00, 9:00, 10:00, 11:00.； If there is no WWVB reception, the alarm clock will search the WWVB time signal every 2 hours until the WWVB time is received. After reception, this alarm clock will only search for the atomic signal after midnight.