La Crosse Technology WT-3144S 14 Inch Atomic Analog Silver Wall Clock Atomic Time with Manual Setting Automatically Sets to set Time Zone (4 USA time zone settings) Accurate to the Second Automatically Updates for Daylight Saving Time (On/Off Option) Battery operation (1 AA not included) and Indoor Use Only Self setting accurate atomic time Automatic daylight saving reset 4 US time zone settings On/Off optional daylight saving time button Requires one AA alkaline battery (not included)