ProVape (http://ProVape.com/) Instructional Video for the proper use of the Atomizer and Cartomizer. Each has a specific shelf-life and it is important to view the video to understand which cartridge is perfect for you. To purchase replacement cartridges, please visit our online store for authorized ProVape Atomizers & Cartomizers http://www.provape.com/ecig-accessories-s/20.htm