FreeStyle Libre 14 Day Sensor Description Small size and comfortable to wear. About the size of two stacked US quarters, the sensor may be scanned through clothing. Painless application. A very thin filament sits just under the skin to measure interstitial fluid. Accurate sensor readings. No fingerstick calibrations required, and the system has no interference with medications containing acetaminophen. Water resistant. Stays on the body for up to 14 days, and can be worn while swimming, showering, or exercising. Continuous monitoring. Measure your glucose every minute, and stores readings every 15 minutes. FreeStyle Libre 14 Day Sensor Includes: 1 Sensor 1 Sensor Applicator Product Insert Reader not included