Eco-Drive Quartz movement. Charges in Sunlight or Indoors - No Batteries to Change - Ever!  6 months Power Reserve.

GPS Solar Quartz caliber 7X52.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz Chronograph caliber 8X82.  No Batteries to Change. 

GPS Solar Quartz caliber 7X52.  No Batteries to Change. 

GPS Solar Quartz caliber 7X52.  No Batteries to Change. 

GPS Solar Quartz caliber 7X52.  No Batteries to Change.