[Accurate Automatic Wall Clock] Geevon 12" atomic clock battery operated has an accurate built-in receiver that can automatically synchronize with WWVB broadcasts from the National Institute of Research (NIST) located in Fort Collins, Colorado. There are 4 time zoned for you to choose. Also, the large atomic wall clock will automatically adjusts for Daylight Saving Time (ON/OFF option). [Battery Operated Atomic Clock] Powered by 1 AA alkaline battery (included), this self setting clock will receive longer and more stable power. In addition, the movement of the atomic analog wall clock is equipped with a with a dust cover, which can prevent dust from entering the movement and affecting its operation. The service life of the atomic wall clocks battery operated will be greatly extended [Durable and Sturdy] The frame of this Atomic Kitchen Wall Clock is made of excellent quality ABS with good durability wear resistance and high hardness and glossy finish. [Easy to Hang] The 12 i