Dimensions:
Case Diameter : 1.625 "

All Features:

• Radio Controlled Time & Date Set Automatically
• LCD with Exact Digital Date or Seconds Display
• Automatically Adjusts for Daylight Saving Time
• Manual Transmission Seeking Function
• US Time Zone Selection
• Water Resistant up to 100 ft.

Specifications:

Power requirements: 1 "3V CR2025" Lithium Batter