Citizen Radio-Controlled Desk Clock 4RL435 F-light R435 ◆Functions◆ ●Radio clock (Automatically selects 40kHz/60kHz radio waves) Receives radio waves easily near windows ●Automatic night light type Brightness switch (Strong/Weak/OFF) ●Nighttime silent second hand / Step second hand With afterglow function light ●Electronic sound alarm with a precise alarm at 0 seconds ●Snooze function that sounds again after stopping ◆Battery: 2 x AA batteries (for testing) ◆Light: With light ◆125 x 118 x 69mm, approx. 300g ◆Color: White ◆Frame material: Plastic frame Once it arrives, insert the batteries (the time will not be set at that point) and place it in a place where radio waves are easily received for about 24 hours, and the time should automatically synchronize. Thank you.