The Sovrin Battery Kit is the simplest, most easy to use device on the market. Simply attach the tip to the battery and the device is ready for use. There are no buttons or on/off feature. So to use the device just suck through the mouthpiece and enjoy. The LED light at the bottom will slow to indicate the device is in use. As a safety feature the battery will temporarily turn off after 10 seconds of use. (CARTRIDGE NOT INCLUDED)