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SYSTEM OVERVIEW: THE MODULAR DESIGN The90 Gem is a high-precision UV sensor designed for versatility. Your device consists of two distinct parts: The Gem: This is the removable, hexa-circle sensor module containing the UV sensor, 3-axis accelerometer, and Bluetooth chip. The Pendant: The primary Gold or Silver-hued Titanium housing for your Gem. Assembly: To wear the Gem, snap it into the Pendant from back to front with the black quartz glass facing out. Ensure the small sensor window is at the top, closest to the bale (the loop where the chain attaches). Future-Ready: The Gem is designed to be moved between different form factors. While you may have purchased it as a pendant, the modular "Gem" core is compatible with future official accessories, such as an upcoming Gem Clip.