[ Easy to use ] - Assembly can be completed in 10 seconds. [ High Quality ] - Made of high quality material, these accessory is latex-free, no smell, more durable and lightweight to maximize comfort. [ Reusable ] - These accessories are reusable and easy to clean. Please clean them after each use to extend the lifetime. [How to use] 1. Open the package to ensure that the oxygen pipe is not damaged; 2. Connect the catheter port to the oxygen supply port of the oxygen supply device, open the oxygen supply device, and adjust the flow rate to the appropriate level; 3. Ensure that the oxygen pipe is closely connected to the mask; 4. Adjust the oxygen mask elastic band and metal strip to ensure that it fits the face. Date First Available November 8, 2023