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The two units are linked via the latest Bluetooth v4.0 Environmental Protocol (ESP) and free display apps are available for both iOS (v8.4 and later) and Android (v4.4 and later) phones. The Skywatch BL range of weather sensors consists of two components: a cylindrical miniature sensor pack, about 4.5″ tall by 1″ in diameter (116x26mm) and your own existing smartphone, which is used for the real-time display of data.