Sangamo Q551.13.12 Astro Zone 2 3Pin Time Switch On/Off & Option. Sangamo Have Been Manufacturing Time Clocks In The Uk For Over 90 Years. It Is A Name That Is Synonymous With Reliability And Quality, Which Is Why Organisations And Individuals Keep Coming Back To Sangamo For Their Control Needs. The Sangamo Q550 Solar Dials Are Available In 4 Variations. The Item You Require Is Dependent On The Area In The British Isles In Which The Unit Will Be Installed. This Is Because The Switch Is Adjusted To Match Any Differences In Sunset And Sunrise Times. The Sangamo Q551-13-12 Is A Solar Time Switch Which Is For Use On Areas In The South Of England And Wales. It Can Be Used For Stairwell, Security And Street Lighting. When It Is Set, The Switch Automatically Tracks Sunset And Sunrise All Year Round. It Can Be Left Unattended For Years And It Will Continue To Operate. This Means That Maintenance Is Greatly Reduced. Please See The Map For Extra Zone Information.