SkyScan Atomic Clock with Indoor Temperature New SkyScan/Sky Scan Atomic Wall Clock Model 84063 Radio Controlled Clock, clock set automatically, synchronized with the official atomic clock located in Boulder, Colorado, USA, which is accurate to 1 second over 60 million years!! Dimension: Clock size: 11" x 7.9" Screen size: 7" x 4.9" Indoor temperature + Calendar + Spring Forward + automatic updates Perpetual Calendar + 4 time zone settings + 12/24 hour time display + hang or stand