[100% GUARANTEE] 30days money back ,return or replacement if you do not satisfy. Buy now these best libre/libre 2 patches. WATERPROOF-Ensures for a long time use, the waterproof libre patches tested can stay on skin up to 10 days once correctly applied. Suit for everyday showering and pool use. EASY REPLACE- Since they don't stick to the sensor itself, over patches can easily be replaced at any time and as often as needed. Once they start to peel off or look dirty. SECURE- The plastic cover holds the sensor on the body and protects it from physical impacts. The transparent O-Ring Patches will help fix the sensor on skin firmly. WHAT YOU GET- One re-useable plastic cover and 40pcs libre over-patches. This cover sit around the libre and is secured by an additional ring-shaped overpatch,which make them a great libre partner.